Questions tagged [covid-19]

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

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0 answers
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Duration of protection from booster: 2 sinopharm + 1 pfizer

Prior research: Here it says that protection from booster can last relatively long (But I think the study assumes all doses (2 main + 1 booster) were mRNA.): The Omicron variant can dodge ...
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How long does infection based Omicron immunity last?

I'm reading different articles/researchs regarding Omicron immunity. Figures for immunity vary from 6 to 4, 3 and 1 month. Is there any more clarity on this issue now? How long does Omicron immunity ...
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Is Omicron now confirmed less lethal than influenza?

Back in March, a study made in Japan comparing Omicron with influenza, when most of the Japanese population (about 90%) had only 2 vaccine doses, and no previous infection with Omicron, claimed ...
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3 answers
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What is the meaning of "co-formulated"?

I was reading the The right drug for the right patient section of the University of Sydney website, which provides these clinical guidelines (flow chart), and says (bold my own): There are no studies ...
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Covid 19 rapid test possible errors from waiting too long to read?

What are the error modes of waiting too long to read a rapid antigen test? Does this increase the probability of the user reading a false positive, false negative, or both? How does this depend on ...
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Negative COVID test day of event, positive next morning. What is the risk of transmission?

Imagine someone attends a relatively large social gathering during the day and evening. That morning they had a negative COVID test. There was substantial close contact, such as hugging. The next day, ...
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False positives of PCR test on symptomatic individuals

On this website, I see that less than 2% of people who don’t have Covid-19 test positive with a PCR test. What happens to this percentage when we only consider symptomatic people? So my question is: ...
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Administration of Covid Vaccine for Small Children in the EU

Is there a way to see the progress of the administration of Covid vaccines for small children (age under five) in the EU? It is not easy to find all information in the usual news sources. Maybe there ...
11 votes
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Why does the World Health Organization still treat COVID-19 as a pandemic, when it is now reportedly causing fewer deaths than influenza?

Supposedly the World Health Organization is the top authority worldwide for public health. One would hope that they base their decisions on empirical data and not beliefs. However, from my perspective,...
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1 answer
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Rapid Response COVID-19 Antigen Test: What can be assumed by the control bar?

Rapid COVID-19 antigen tests include a control line similar to this: From Case Western Reserve rapid testing instruction available here. What does the control bar/strip control for? All the ...
2 votes
2 answers
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What is the difference between different mask standards?

I am looking at buying a new batch of masks, since I still prefer to use a mask for my travelling. I am close to running out again, and the company that I previously got masks from now has a 'new' ...
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Is there any evidence that honey can help a COVID cough? [duplicate]

A cough is a frequent clinical sign of COVID-19, and there is some indication that coughing can cause lung "sprain" and long lasting damage. The UK National Health service has a page on Self-...
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Would slight shifting of administration times of Paxlovid impact its efficacy?

Paxlovid (nirmatrelvir/ritonavir) is an oral medication indicated for patients recently diagnosed with COVID-19 and who are at high risk of deterioration. This drug received an emergency use ...
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Why should males use contraception for longer after taking molnupiravir for COVID?

Molnupiravir (brand name Lagevrio) is a small-molecule antiviral prodrug active against SARS-Cov-2 and in one trial was found to reduce risk of hospitalization or death from COVID by 52% (Jayk Bernal ...
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5 votes
1 answer
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Why are COVID nucleic acid tests sometimes reported with non-integer CT values?

I saw a positive COVID test, and the CT value was not reported as an integer value. Instead, it was reported with two decimal point precision. I expected the CT value to be the number of PCR cycles. I ...
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Why are some vaccines 100% effective while others aren’t? [closed]

Why are some vaccines, like for rabies, 100% effective at treating someone while others, like the covid 19 vaccine, isn’t. Disclaimer: not a dumb vaccine skeptic or anything just genuinely curious.
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Covid may cause brain to degenerate three times faster than normal?

I found this study on GB News: Covid may cause brain to degenerate three times faster than normal, Oxford study suggests After reading the article I still have a few questions. I found the study ...
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Can someone point me to a good, up-to-date review article on the effectiveness of vaccines against the omicron variant of the coronavirus?

I would like to learn about the effectiveness of vaccines against the omicron variant of the coronavirus. I believe a review article from a scientific journal would have the best information. I ...
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1 answer
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Is there any general consensus in the research on what the maximum duration is that the mRNA vaccine spike remains in the body?

Is there any general consensus in the research on what the maximum duration is that the mRNA vaccine spike remains in the body? I thought I read some time ago from CDC but could be mistaken that at ...
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Effectiveness of COVID-19 "booster" (typically the third shot) when being administered after a long time following the initial two doses

In layman's terms, "booster" seems to mean to enhance upon the initial vaccination dose(s). This article suggests administering it after about six months. I am considering having the third ...
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Does this infographic show that masks increased the transmission of COVID-19 in Los Angeles County?

As the title says, my father alleges that this graph shows that masks have increased COVID-19 rates. Does the graph prove this relationship, or is this just a faulty correlation?
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Ivermectin Paper with Hard To Believe Conclusion, Can I Get Some Help? [closed]

Is this a robust study and are the conclusions supported by the data? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8417612/ Emphasis is mine. Two doses (300 μg/kg/dose in a gap of 72 hours) of ...
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How Long Must a Window Remain Open to Decrease the Risk of COVID?

Suppose there is an emergency and 10 fire fighters enter an apartment. None are wearing masks. Many public health authorities recommend opening windows to decrease the risk of COVID-19 infection. For ...
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smoking and coronavirus [closed]

In the beginning of the coronavirus pandemic, there was some noise about smoking being a risk factor when contracting coronavirus disease. Then there was a deafening silence. Beginning of 2022, what ...
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How long after COVID-like symptoms start can one still find out if what they had was COVID?

Suppose someone has COVID-like symptoms. Let's pick an arbitrary date; say they wake up coughing on February 1st, 2022, with no prior symptoms, and unknown potential exposure date. If this person is ...
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Did covid vaccine studies use an active placebo (with side effects)?

I know that the studies done by Pfizer, et al, used standard methods with a placebo control group. If you read about blinded experiments here, it mentions: A common cause for unblinding is the ...
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Has there been any medical studies as to whether drinking a 'Hot Toddy' can help to ward off or to help heal someone who has COVID-19? [closed]

I am curious to know if there has been any medical studies that have been conducted to ascertain if drinking a 'Hot Toddy' every day will decrease the odds of someone being infected by the COVID-19 ...
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What do we know about Long Covid and Omicron?

Longer term covid symptoms/sequalia ("Long covid") tentatively seem to be attributed to the virus playing havoc with bodily organs, the bloodstream, perhaps the immune system, and so on. Its ...
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Help interpreting PCR lab results [closed]

Started isolating after my brother, who I live with tested positive, and four days later I was also testing positive (making it likely he transmitted it to me). I did a PCR test and the lab returned ...
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1 answer
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Is the WHO guideline on registering covid-19 deaths very expansive?

In this WHO guidelines document: Guidelines for certification classification of covid-19 as cause of death, it says: 2. DEFINITION FOR DEATHS DUE TO COVID-19 A death due to COVID-19 is defined for ...
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Can a RT-PCR test claim 100% sensitivity and specificity?

A recent RT-PCR test for SARS-CoV-2 from a private laboratory lists the test's sensitivity and specificity as 100%. The test certificate lists this next to the result: Ref. value/Норма Negative (...
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How accurate is this covid-19 article related to reinfection risk after recovering from omicron?

Sorry if this is wordy. I've tried to include the research I did, before asking. If anything is poorly worded, let me know, I'll try to fix it. This article, although sketchy, and slightly ...
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Why is the flu more deadly to children than COVID-19?

Or better framed: Why are children not developing as severe reactions from COVID when they tend to fare much worse from seasonal flu? Is the answer something along the lines of: Those that don't die ...
1 vote
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Susceptibility of β-Thalassemia Heterozygotes to COVID-19

A recent study by medical researchers in Greece (https://pubmed.ncbi.nlm.nih.gov/34441941/) concluded that β-Thalassemia Heterozygotes (carriers) are more susceptible to severe symptoms of COVID-19 as ...
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3 answers
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Are covid vaccinations and boosters still useful and if not, why are governments and agencies promoting them?

So regarding Omicron, the latest research shows that vaccines and convalescent immunity have no or negligible effect on Omicron, and that booster shots have very little neutralising activity. On the ...
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Any merit to the notion of limiting COVID19 vaccine only to those aged 60+ or with a comorbidity

Last night I heard Peter Navarro, Trade Czar under the Trump administration, being interviewed on TV. He was plugging his new book. During the course of the sloppy interview, in which he and the ...
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Is the risk of cardiac arrest still superior, for unvaccinated people contracting Omicron, than for people receiving RNA vaccines?

According to this article, Vaccines linked to small heart inflammation Among those who had received the Pfizer vaccine, the researchers noted, the rate of myocarditis or myopericarditis was 1.4 cases ...
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1 answer
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How long it will take for a RT-PCR test CT value to go to from 27 to 35?

A RT-PCR test came positive and the CT value is 27, which means apparently a low contagion level. But is there a way to estimate when (in average) it could go til 35 (the cutoff)? The graph from here ...
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How does eating or drinking affect lateral flow tests using nasal swab only?

With Covid testing in England (not sure about Wales, Scotland and Northern Ireland) the free lateral flow kits have been in 2 forms. The first DHSC kits DHSC (Department of Health and Social Care) ...
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1 vote
1 answer
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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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1 answer
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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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-2 votes
1 answer
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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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1 vote
1 answer
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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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1 answer
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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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