Questions tagged [covid-19]

Describes the clinical disease caused by the SARS-CoV-2 virus

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Spreading covid talking vs breathing risks

Some links claim one can spread covid merely by breathing (not talking): Currently available research supports the possibility that SARS-CoV-2 could be spread via bioaerosols generated directly by ...
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How soon after the second Sinopharm jab can you safely get a Pfizer booster jab?

Imagine someone was in a hurry to get high immunity (the Sinopharm jabs are said to be at best only moderately effective) , or there was a free Pfizer booster jab available for a limited time. What is ...
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After exposure to covid when is someone contagious?

Here it says: The time from exposure to symptom onset (known as the incubation period) is thought to be two to 14 days, though symptoms typically appear within four or five days after exposure. We ...
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The number of active cases of COVID

I have been looking at this URL for information about Covid: Graph of number of active cases of Covid In particular, I am looking at the graph of the number of active cases. I would expect/hope that ...
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Cardiovascular complications associated with COVID 19 by vaccination status and, if vaccinated, by type

I apologize if this is an obvious question. I think I am not finding research on this because I am asking the question wrong in literature searches. I am far outside my normal area of academic ...
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COVID-19: Natural infection compared to vaccination

It is often stated that getting infected gives a lesser immunological protection from covid, than a vaccine, but studying immunology.org - I'm getting the feeling that the immunization is merely more ...
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Does covid significantly increase the chances of losing a baby? [closed]

As two late 20s early 30s healthy adults, both vaccinated with two dosages of Moderna more than 6 months ago, we suspect a pregnancy (wanted!). We've heard that being ill with Covid-19 increases the ...
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The number of new cases of COVID

I have noticed that the number of new Covid cases in the United States is running roughly 100,000 per day and increasing. What percentage of those new cases are people that are fully vaccinated? In an ...
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How reliable are Covid-19 antigen quick tests for vaccinated, asymptomatic infected?

A few weeks back, virologist Dr. Drosten tweeted "Before onset of symptoms, quick tests are not sensitive enough [...] Sensitivity appears lower in vaccinated (preliminary data) [...]" (...
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Which is the best COVID-19 booster dose for a patient in their forties?

The Iranian government now recommends booster doses for those 40 years old or older. Most people in Iran were vaccinated with Sinopharm. For a booster, they can choose between Sinopharm, Astrazenk, ...
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Covid-19 - Spain - A completely unvaccinated person, wants the covid-certificate, logic of requiring all 3 jabs, instead of just latest 1 or 2 jabs?

Covid-19 - Spain - A completely unvaccinated person, wants to get the covid-certificate / covid-passport, what's the logic of requiring all 3 jabs, instead of just the latest 1 or 2 jabs ? Is the ...
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Does quarantine after testing positive for covid19 make the virus more dangerous?

This might be a stupid question, but I feel unable to assess that, so I've decided to ask anyway. My assumptions: RNA Viruses mutate always, all the time. Mutations with milder symptoms are likely to ...
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Where is the data for Covid-19 vaccine safety in medium term and/or for people with chronic health conditions?

I have several middle-aged relatives which are... let's say postponing their vaccination due to fears of their safety. Now, I know there are some people who will never be convinced by anything, ...
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What is a person called before he is a patient

I am working on COVID related app. There is a scenario when I need to collect details of person who wants to have COVID tests. I want to show a label on the app whose meaning is: Details of a person ...
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For how long does the legal requirement to report deaths after COVID-19 vaccination to VAERS last?

The US Health and Human Services VAERS FAQ for COVID-19 says (emphasis in original): What adverse events should healthcare providers report to VAERS after COVID-19 vaccination? [...] Healthcare ...
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Is there any identified policy Japan is doing to successfully reduce COVID-19 the other countries aren't using?

By the end of October 2021, while many europeans countries are having 10,000 to 40,000 cases per day, Japan with a much larger population is having less than 100 cases covid cases per day. When you ...
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What is the difference between mutation and variant?

What is the difference between mutation and variant? News reports last week called Omicron a mutation of SARS-CoV-2; but this week they are calling it a variant and they are adding that it has a lot ...
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CDC - Severity of Disease Among Adults Hospitalized - Covid

The cdc published Severity of Disease Among Adults Hospitalized with Laboratory-Confirmed COVID-19 Before and During the Period of SARS-CoV-2 B.1.617.2 (Delta) Predominance — COVID-NET, 14 States, ...
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How much less effective are the antibodies produced against the Alpha-SARS-CoV-2 spike protein against the Delta-SARS-CoV-2 spike protein? [closed]

When viruses mutate and the surface of a protein changes that usually results in the antibodies that the body produced against an earlier form of the virus working less well. By what factor do ...
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Re - Covid-19 - Mandatory vaccination - What's the logic behind not checking for antibodies in individuals before requiring their vaccination? [closed]

The Question Re - Covid-19 - Mandatory vaccination - In countries with mandatory vaccination, what is the logic behind not checking for antibodies in individuals, before requiring the vaccination of ...
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Will the COVID-19 virus ever stop mutating into new variants? [closed]

I am curious to know if it has been discussed within the medical community as to whether the COVID-19 virus will ever stop mutating into new variants, and if it has been discussed, what is the ...
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Antibodies and Immune system

I was just educated by my physician about some details of the differences between the qualitative and the semi-quantitative COVID-19 antibody tests. I understand now that the result of the semi-...
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What percent of deaths caused by influenza list no other comorbidities on the death certificate?

You may remember the bit of covid misinformation that circulated awhile ago saying that only 6% of the official covid death numbers were actually due to covid https://www.factcheck.org/2020/09/cdc-did-...
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Why *exactly* are mRNA covid vaccines delivered intramuscularly?

I would like to understand what exact processes make intramuscular injection of particularly mRNA covid vaccines the best delivery option. I've asked doctors and googled, but I get contradictory ...
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Moderna vs Pfizer booster

What published studies exist to support the choice of Moderna or Pfizer booster? The only study I could very quickly find is below. The study seems a bit preliminary, exactly as it says on the tin. I ...
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What's the incubation period for COVID-19

My parents are both infected with the delta variant of COVID-19 and I have searched for the incubation period for that particular string. But I couldn't find any answer. Delta variant is highly ...
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Do flu shots make sense during the COVID-19 pandemic?

My understanding is that the flu shot is a good idea based on a cost benefit analysis. People are likely to get the flu and get sick and the flu shot helps with this. On the other hand, the flu shot ...
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Does this Covid-19 vaccine study suggests a 1 to 718 rate of adverse effects?

As I have not much skill in reading medical research, I wanted to verify my calculation of this research result. A big peer-reviewed research paper entitled Safety of the BNT162b2 mRNA Covid-19 ...
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Are Covid-19 vaccines much more deadly than people (and scientists) think?

The other day I read this chart on an Italian newspaper article I looked for the source, and I found only this tweet: https://twitter.com/Drs4CovidEthics/status/1432193260949172230 from Doctors for ...
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Why did J&J go for one dose?

The latest news from the US is that the CDC & FDA recommend a booster shot after only two months following the "single dose" J&J vaccine. Given the Fauci comment that J&J "...
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Did the NIH study find Moderna - Moderna gave more antibodies than Moderna-Pfizer?

An NIH study studied the efficacy of different combinations of Covid-19 vaccines in terms of the level of antibodies produced. Dr. Rob Swanda tweeted out a chart summarizing the results: So it seems ...
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Vaccine death efficacy calculation and how it works

I am no medical expert, am just curious how vaccines work in general, especially in preventing severe illness and deaths. I have read articles, seen videos on youtube, and seen how efficacy is ...
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COVID-19 exposure risk from passing joggers versus walkers

What is the COVID exposure risk from passing close by someone who is jogging relative to passing close by someone who is walking? The reason I ask is with regard to going out for exercise, or to run ...
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How do the viral loads of vaccinated and unvaccinated asymptomatic, and symptomatic individuals differ for COVID-19?

I'm searching for information regarding the above question, but I seem to keep finding conflicting information. Some articles say that asymptomatic people have higher viral loads than symptomatic ...
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Is booster dose needed for chinese vaccines

I can't seem to easily find such information and would greatly appreciate some help. Does anyone have information if booster (third) dose is required or recommended for Chinese Covid vaccine sinopharm?...
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What are the concrete odds of myocarditis in using Modena vs Pfizer vaccine, according to the Nordic agencies' data/studies?

It's been reported that some Nordic countries have suspended the Moderna vaccine from younger age groups, due to an increased incidence of myocarditis, seemingly relative to Pfizer. However, even ...
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What data supports the safety of COVID-19 mRNA vaccines for women of childbearing age?

I am looking for the actual data (ie, numbers) supporting the widespread consensus regarding the safety of the COVID-19 mRNA vaccines with regards to fertility, pregnancy, and childbirth, as stated ...
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If person got covid vaccine some time ago, should he get flu vaccine?

Say person got covid vaccine several months ago (say one of Chinese vaccines), is it safe to get flu vaccine? Best info I found was from CDC While limited data exist on giving COVID-19 vaccines with ...
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Why US (3 weeks)and UK ( 8 weeks) covid vaccine guidelines differs so much?

I read two differing opinions about corona, one from CDC that says get your second shot as close to the recommended 3-week or 4-week interval as possible Other from BBC UK, that says Covid vaccine: ...
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How can the J&J vaccine shot be effective against COVID-19 if it only has a ~60% efficacy rate?

According to the CDC's page on the safety of J&J vaccines, the reported efficacy rate of the vaccine is a staggeringly low 66.3%. That said, the government is still promoting and touting the J&...
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How do we know that mrna-hijacked cells with spike proteins are not harmful to the body?

If I understand mRNA COVID vaccines correctly, they contain some RNA that is inserted into a cell, which then is instructed to produce the spike protein, which is typical for COVID-19 viruses. Once ...
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Which countries recommend Covid vaccine for pregnant women?

It is still controversial if pregnant women should generally be vaccinated against Covid. As far as I understood, the US-american and English authorities recommend vaccination, while the Germans do ...
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What are the websites providing medical articles?

I'm new here and I'm not sure if my question is off topic, however I need some resources about medical articles concerning the effect of covid on health employees. I found a website called sci-hub but ...
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Was there a clear effect attributable to FFP2 (~N95) mask mandates in Germany in crowded environments (shops, buses, etc.)?

Back in January or so, Bavaria at least mandated FFP2 (roughly equivalent to US N95) masks be worn in shops, buses and presumably similar environments. At least Berlin followed suit some months later ...
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Corona virus and food transmission

I find conflicting info on this CDC cite it says Currently there is no evidence to support transmission of COVID-19 associated with food next it says It may be possible that a person can get COVID-...
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Is there UK data on the reduction in vaccine effectiveness for people who were vaccinated 5+ months ago?

Leaving aside the completely unvaccinated sections of the population (in themselves a huge problem), preliminary data from Israel and the US (in selected cohorts Mayo, CDC--on "frontline" ...
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Using Pfizer as a booster dose if someone was vaccinated with Sinopharm: what is good practice? [closed]

I am curious if there is established practice of using Pfizer as a booster dose if a person was vaccinated with Sinopharm. One example I think is here which says it is possible https://www....
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Is there a more recent official presentation (than Aug 11) on the Israel's Covid-19 vaccine effectiveness, particularly on the booster shot?

If found two-three previous ones (July, 2nd/longer variant, August 11), but Reuters claims on Aug 22 there's one about the booster effectiveness, and it's almost certainly not one of those three I ...
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what is risk of breakthrough infection with pfizer and delta?

There is varying information on this topic, does anybody know is there is any consensus on the rate of breakthrough infections with delta and pfizer vaccine? https://www.cnbc.com/2021/07/23/delta-...
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Does severity of covid vaccine side effects correlate with or suggest anything about how badly that person would have reacted to covid itself? [closed]

Let's say that a person has the covid vaccine and has a relatively bad case of the standard side effects. Does their reaction to the vaccine suggest that they would have also felt very poorly on the ...
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