• The CDC goes anti-vaxx with a report on myocarditis

    From ScottW@21:1/5 to All on Thu Jun 15 16:46:51 2023
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From ScottW@21:1/5 to All on Fri Jun 16 08:05:11 2023
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/

    Does that show a COVID vaccine causes more myocarditis than COVID does?

    In young healthy people...yes.

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Fri Jun 16 09:40:17 2023
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/

    Does that show a COVID vaccine causes more myocarditis than COVID does?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Fri Jun 16 13:20:54 2023
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/

    Does that show a COVID vaccine causes more myocarditis than COVID does?

    In young healthy people...yes.

    I looked. You're making that up. From the same author (Matthew Oster),
    four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare myocarditis/pericarditis temporally associated with COVID-19 vaccine:
    Per 1 million doses of COVID-19 vaccine in male individuals 12 to 29
    years of age (the highest-risk group for vaccine-associated
    myocarditis), 11 000 COVID-19 cases, 560 hospitalizations, and 6 deaths
    would be prevented, whereas 39 to 47 cases of myocarditis would be
    expected. A study demonstrated that receipt of 2 doses of mRNA COVID-19
    vaccine is highly effective in preventing MIS-C in the 12- to
    18-year-old age group: the estimated effectiveness against MIS-C was 91%
    (95% CI=78%-97%). Thus, COVID-19 vaccination is still recommended to
    curb this pandemic, but active efforts are underway to investigate
    potential long-term effects of myocarditis associated with COVID-19 vaccination.

    https://covid19.nih.gov/news-and-stories/covid-19-vaccines-myocarditis

    Myocarditis is a rare complication of COVID-19 vaccination. It affects
    fewer than 20 people per 1,000,000 COVID-19 vaccinations.3,5,7 Only the
    mRNA vaccines (Pfizer-BioNTech and Moderna) have been linked with
    myocarditis. Myocarditis related to COVID-19 vaccines seems to be caused
    by the body’s immune response to vaccination.

    Most people (95%) who develop myocarditis after receiving a COVID-19
    mRNA vaccine have only mild symptoms that go away within a few days.5 Vaccine-linked myocarditis is less likely to cause lingering heart
    problems than myocarditis due to COVID-19 illness.

    Only about 1 out of 100 cases of heart inflammation linked with COVID-19 vaccines is life-threatening.5 An analysis of 627 cases of
    vaccine-linked myocarditis worldwide showed that 626 fully recovered —
    and one fatality.7

    The risk of myocarditis linked with COVID-19 illness is several times
    greater than the risk from vaccination, and it is often more
    serious.3,5,8 This is because the SARS-CoV-2 virus invades cells of the
    heart, plus the body generates an overactive immune response to the
    infection.

    Severe myocarditis can cause long-lasting heart damage or even death. An analysis of almost 400 patients with myocarditis linked with COVID-19
    illness found that about 15% died within 6 months.9

    --- SoupGate-Win32 v1.05
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  • From ScottW@21:1/5 to All on Fri Jun 16 16:25:08 2023
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/

    Does that show a COVID vaccine causes more myocarditis than COVID does?

    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew Oster),
    four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare myocarditis/pericarditis temporally associated with COVID-19 vaccine:
    Per 1 million doses of COVID-19 vaccine in male individuals 12 to 29
    years of age (the highest-risk group for vaccine-associated
    myocarditis), 11 000 COVID-19 cases, 560 hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?

    whereas 39 to 47 cases of myocarditis would be
    expected.

    How many die or suffer life long debilitation?


    A study demonstrated that receipt of 2 doses of mRNA COVID-19
    vaccine is highly effective in preventing MIS-C in the 12- to
    18-year-old age group: the estimated effectiveness against MIS-C was 91% (95% CI=78%-97%).

    What is MIS-C?

    Thus, COVID-19 vaccination is still recommended to
    curb this pandemic, but active efforts are underway to investigate
    potential long-term effects of myocarditis associated with COVID-19 vaccination.

    So the vaxx is not proven safe....yet.
    I'm glad you're a willing guinea pig. Now....go get another shot.

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Fri Jun 16 18:43:00 2023
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does?

    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?

    I know it's tough to do ratios, but you're a science major.

    whereas 39 to 47 cases of myocarditis would be expected.

    How many die or suffer life long debilitation?

    Not many. From the cite: "Fortunately, the outcome of MIS-C is generally
    very good, with resolution of inflammation and cardiovascular
    abnormalities within 1 to 4 weeks of diagnosis. However, some series
    report progression of coronary artery aneurysms after discharge,
    highlighting the potential for long-term complications. Death resulting
    from MIS-C is rare, with a mortality rate of 1.4% to 1.9%."

    A study demonstrated that receipt of 2 doses of mRNA COVID-19
    vaccine is highly effective in preventing MIS-C in the 12- to
    18-year-old age group: the estimated effectiveness against MIS-C
    was 91% (95% CI=78%-97%).

    What is MIS-C?

    Defined at the link: "Multisystem inflammatory syndrome in children
    (MIS-C) is a rare but severe postinflammatory complication of SARS-CoV-2 infection that can cause acute myocardial dysfunction, arrhythmias or conduction abnormalities, and coronary artery dilation...

    Children and some young adults may develop MIS-C, a relatively rare but
    severe inflammatory syndrome generally occurring 2 to 6 weeks after
    infection with SARS-CoV-2 that can affect the heart and multiple organ
    systems. In the first year of the pandemic, >2600 cases of MIS-C
    were reported to the Centers for Disease Control and Prevention, at an estimated rate of 1 case of MIS-C per 3164 cases of SARS-CoV-2 infection
    in children."

    Thus, COVID-19 vaccination is still recommended to curb this
    pandemic, but active efforts are underway to investigate potential
    long-term effects of myocarditis associated with COVID-19
    vaccination.

    So the vaxx is not proven safe....yet.

    Proven safer than COVID. Do you think science just closes the books?

    I'm glad you're a willing guinea pig. Now....go get another shot.

    Gotta wait for the fall.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From ScottW@21:1/5 to All on Fri Jun 16 18:23:40 2023
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does?

    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual
    splat plop...missed the pot again...fashion.

    BTW....are you out sharing your "trans-joy" by flashing people?
    Or do you have a phobia?

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Art Sackman@21:1/5 to ScottW on Fri Jun 16 18:41:17 2023
    On Friday, June 16, 2023 at 9:23:42 PM UTC-4, ScottW wrote:
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does? >>>
    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.
    You're the one spouting irrelevant data in your usual
    splat plop...missed the pot again...fashion.

    BTW....are you out sharing your "trans-joy" by flashing people?
    Or do you have a phobia?

    ScottW

    Steve suffers from blindlinkophobia

    I found my phobia, but I am too afraid type its name.
    Here is a link. I cut and pasted it

    https://www.verywellmind.com/hippopotomonstrosesquipedaliophobia-2671752



    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Sat Jun 17 09:15:21 2023
    On 6/16/23 8:23 PM, ScottW wrote:
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does? >>>>>
    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual

    You have the cite. You have the rate of complications which is an apt
    comment on your subject. If you want to move the goal posts from
    "myocarditis" to "any health issue," bring your own evidence.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From ScottW@21:1/5 to All on Sat Jun 17 14:36:13 2023
    On Saturday, June 17, 2023 at 7:15:25 AM UTC-7, mINE109 wrote:
    On 6/16/23 8:23 PM, ScottW wrote:
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does? >>>>>
    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual
    You have the cite. You have the rate of complications which is an apt comment on your subject. If you want to move the goal posts from "myocarditis" to "any health issue," bring your own evidence.

    I didn't move it. You ignored what I said and splattered irrelevant data in response....again.

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Sat Jun 17 17:43:08 2023
    On 6/17/23 4:36 PM, ScottW wrote:
    On Saturday, June 17, 2023 at 7:15:25 AM UTC-7, mINE109 wrote:

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with
    COVID-19 vaccine:...

    How many had no health issues?

    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual
    You have the cite. You have the rate of complications which is an
    apt comment on your subject. If you want to move the goal posts
    from "myocarditis" to "any health issue," bring your own evidence.

    I didn't move it.

    When I showed evidence about myocarditis, you asked about all other
    health issues. BTW, the CDC cite shows your subject line is false.

    If you have a question, ask it. If you have evidence, show it.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Sat Jun 17 18:27:23 2023
    On 6/17/23 4:36 PM, ScottW wrote:
    You ignored what I said

    And I read more of the study you cited than you probably did or you
    wouldn't have said it showed more myocarditis after vax then after COVID
    in "young healthy people."

    https://jamanetwork.com/journals/jama/fullarticle/2788346

    You won't find a comparison of vaxed vs unvaxed rates.

    A similar study, six months later:

    https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(22)00791-7/fulltext

    "An increased risk of myocarditis or pericarditis was observed after
    COVID-19 mRNA vaccination and was highest in men aged 18–25 years after
    a second dose of the vaccine. However, the incidence was rare. These
    results do not indicate a statistically significant risk difference
    between mRNA-1273 and BNT162b2, but it should not be ruled out that a difference might exist. Our study results, along with the benefit–risk profile, continue to support vaccination using either of the two mRNA vaccines."

    And comment on the original study:

    https://jamanetwork.com/journals/jama/fullarticle/2792630

    "The case series by Dr Oster and colleagues described adverse event
    reports of myocarditis following SARS-CoV-2 messenger RNA (mRNA)
    vaccination from the Vaccine Adverse Event Reporting System (VAERS).1
    The authors purported to answer the question “What is the risk of
    myocarditis after an RNA-based COVID-19 vaccination in the US?” However,
    it is not possible to calculate risk or incidence rates from passive surveillance. Due to reporting regulations and limitations of passive surveillance, VAERS reports are a biased subset of events."

    Hot off the press, a meta study:

    https://www.nature.com/articles/s41541-023-00681-3

    Here's a good starting point: "In weighing risks and benefits the United
    States Advisory Committee on Immunization Practices (ACIP), for example,
    found that the documented hazards of COVID-19 infection and its
    potentially severe complication (such as hospitalization, death, and
    long COVID) exceeded the potential risks of experiencing rare adverse
    events following vaccination, including the risk of developing
    myocarditis and pericarditis."

    That said, booster dosage is likely safer than second dose dosages. Vax associated myocarditis is generally mild:

    "Important factors are that, first, all school-aged children can be
    affected by SARS-CoV-2 cardiovascular complications. This can be
    mediated by multisystem inflammatory syndrome in children (MIS-C),
    resulting in cardiac problems, which account for the majority of
    pediatric COVID-19 mortality. Second, SARS-CoV-2 cardiovascular
    complications can negatively affect children and adolescents in settings
    with variable resources. Third, the prognosis appears to be excellent in individuals with myocarditis caused by the COVID-19 vaccination."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From ScottW@21:1/5 to All on Sat Jun 17 18:31:16 2023
    On Saturday, June 17, 2023 at 7:15:25 AM UTC-7, mINE109 wrote:
    On 6/16/23 8:23 PM, ScottW wrote:
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does? >>>>>
    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual
    You have the cite. You have the rate of complications which is an apt comment on your subject. If you want to move the goal posts from "myocarditis" to "any health issue," bring your own evidence.

    Listen up moron, I'll only clarify for your brain deadness once.
    How many of those covid hospitalizations and deaths were healthy young people?
    Not many I'll bet.

    ScottW

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From mINE109@21:1/5 to ScottW on Sun Jun 18 13:51:34 2023
    On 6/17/23 8:31 PM, ScottW wrote:
    On Saturday, June 17, 2023 at 7:15:25 AM UTC-7, mINE109 wrote:
    On 6/16/23 8:23 PM, ScottW wrote:
    On Friday, June 16, 2023 at 4:43:03 PM UTC-7, mINE109 wrote:
    On 6/16/23 6:25 PM, ScottW wrote:
    On Friday, June 16, 2023 at 11:20:59 AM UTC-7, mINE109 wrote:
    On 6/16/23 10:05 AM, ScottW wrote:
    On Friday, June 16, 2023 at 7:40:19 AM UTC-7, mINE109 wrote:
    On 6/15/23 6:46 PM, ScottW wrote:
    https://slaynews.com/news/heart-disease-risk-soars-13200-among-vaccinated-cdc-confirms/



    Does that show a COVID vaccine causes more myocarditis than COVID does? >>>>>>>
    In young healthy people...yes.
    I looked. You're making that up. From the same author (Matthew
    Oster), four months later:

    https://www.ahajournals.org/doi/10.1161/CIR.0000000000001064

    Vaccine-Associated Myocarditis

    The benefit of COVID-19 vaccine outweighs the risks of rare
    myocarditis/pericarditis temporally associated with COVID-19
    vaccine: Per 1 million doses of COVID-19 vaccine in male
    individuals 12 to 29 years of age (the highest-risk group for
    vaccine-associated myocarditis), 11 000 COVID-19 cases, 560
    hospitalizations, and 6 deaths would be prevented,

    How many had no health issues?
    I know it's tough to do ratios, but you're a science major.

    You're the one spouting irrelevant data in your usual
    You have the cite. You have the rate of complications which is an apt
    comment on your subject. If you want to move the goal posts from
    "myocarditis" to "any health issue," bring your own evidence.

    Listen up moron, I'll only clarify for your brain deadness once.

    If you want to default on your argument, that's up to you.

    How many of those covid hospitalizations and deaths were healthy young people?
    Not many I'll bet.

    Wouldn't those with comorbidities be more likely to be vaccinated,
    skewing the post-vax complication numbers upwards?

    There is a known rate of myocarditis in the age group you specify. There
    is an unknown rate of post-vax myocarditis in your cited study because
    of the nature of the reporting system.

    https://www.cdc.gov/mmwr/volumes/71/wr/mm7114e1.htm

    "Among males aged 5–11 years, the incidences of myocarditis and
    myocarditis or pericarditis were 12.6–17.6 cases per 100,000 after
    infection, 0–4 after the first vaccine dose, and 0 after the second
    dose; incidences of myocarditis, pericarditis, or MIS were 93.0–133.2
    after infection (Table 2). Because there were no or few cases of
    myocarditis or pericarditis after vaccination, the RRs for several
    comparisons could not be calculated or were not statistically
    significant. The RRs were significant when comparing myocarditis,
    pericarditis, or MIS in the 42 days after infection (133.2 cases per
    100,000) with myocarditis or pericarditis after the first (4.0 cases per 100,000; RR 33.3) or second (4.7 cases per 100,000; RR 28.2) vaccine dose."

    To review: after infection, 12.6–17.6 cases per 100,000;
    after first vax, 0-4 per 100,000;
    after second, 0 per 100,000

    "Among males aged 12–17 years, the incidences of myocarditis and
    myocarditis or pericarditis were 50.1–64.9 cases per 100,000 after
    infection, 2.2–3.3 after the first vaccine dose, and 22.0–35.9 after the second dose; incidences of myocarditis, pericarditis, or MIS were
    150.5–180.0 after infection. RRs for cardiac outcomes comparing infected persons with first dose recipients were 4.9–69.0, and with second dose recipients, were 1.8–5.6; all RRs were statistically significant."

    To review: after infection, 50.1–64.9 cases per 100,000;
    after first vax, 2.2–3.3 per 100,000;
    after second, 22.0–35.9 per 100,000

    "Among males aged 18–29 years, the incidences of myocarditis and
    myocarditis or pericarditis were 55.3–100.6 cases per 100,000 after infection, 0.9–8.1 after the first vaccine dose, and 6.5–15.0 after the second dose; incidences of myocarditis, pericarditis, or MIS were
    97.2–140.8 after infection. RRs for cardiac outcomes comparing infected persons with first dose recipients were 7.2–61.8, and with second dose recipients, were 6.7–8.5; all RRs were statistically significant."

    To review: after infection, 55.3–100.6 cases per 100,000;
    after first vax, 0.9–8.1 per 100,000;
    after second, 6.5–15.0 per 100,000

    Discussion

    "Even among males aged 12–17 years, the group with the highest incidence
    of cardiac complications after receipt of a second mRNA COVID-19 vaccine
    dose, the risk was 1.8–5.6 times as high after SARS-CoV-2 infection than after vaccination...

    Cardiac complications were rare after SARS-CoV-2 infection or mRNA
    COVID-19 vaccination. However, the risks for these complications were
    higher after infection than after vaccination among males and females in
    all age groups. These findings provide important context for balancing
    risks and benefits of mRNA COVID-19 vaccination among eligible persons
    ≥5 years."

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