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Questions tagged [covid-19]

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

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19 votes
3 answers
8k views

How accurate are coronavirus tests?

As of time of writing it's quite common to see headlines about so-and-so who have tested positive for Covid-19, e.g. Canadian PM Justin Trudeau's wife, Sophie, tests positive for coronavirus, ...
Allure's user avatar
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35 votes
5 answers
14k views

Does COVID-19 have a case fatality rate of 41%? Is this formula correct?

According to the data on the Johns Hopkins Coronavirus Tracker, as of 3rd February 2020 there were 17491 confirmed cases of COVID-19 globally, 536 total recoveries and 362 deaths. From my non-expert ...
DrMcCleod's user avatar
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7 votes
2 answers
949 views

BNT162b2 mRNA Covid-19 Vaccine efficacy after 1st dose - explain the statistics

Pfizer's paper (Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine) published recently states the following in the Efficacy subsection of the Results section: Between the first dose and the ...
Don_S's user avatar
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1 vote
5 answers
615 views

Why aren't we sterilizing N95 masks?

Please forgive the obvious question. H2O2 vapor sterilization is deadly for the layperson but should be workable for hospitals. I can't find the small Chinese study I read the other day about it. ...
Forever_A_Student's user avatar
13 votes
3 answers
771 views

Was there ever a vaccine candidate that showed negative side effects many months or years after the patient was injected?

The current prognosis for a COVID-19 vaccine to become available is "12-18 months" and a big part of the reason for such a long timeline is the fact that scientists want to ensure that the vaccine is ...
JonathanReez's user avatar
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21 votes
2 answers
2k views

What is the main way COVID-19 spreads?

Reading numerous news articles about COVID-19, I got confused as to what is its main transmission route. In particular, I am confused as to whether it is direct landing of respiratory droplets in ...
Mitsuko's user avatar
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7 votes
1 answer
206 views

How do mRNA vaccines work and what are their advantages over traditional vaccines?

How do mRNA vaccines work? To my intuitive understanding, for an mRNA vaccine to work, the mRNAs injected into the patient need to first enter a cell and get translated into proteins. Those proteins ...
Remi.b's user avatar
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5 votes
5 answers
324 views

Why are people with COVID-19 symptoms being denied tests in the US?

I have heard several times now, from both people I personally know and from others who have posted their stories online that they do not qualify for COVID-19 testing. From the stories I have heard, ...
backcab's user avatar
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5 votes
1 answer
183 views

How can one predict whether an individual infected with the SARS-CoV-2 virus will be asymptomatic?

According to https://english.alarabiya.net/en/features/2020/03/25/Coronavirus-Iceland-s-mass-testing-finds-half-of-carriers-show-no-symptoms, half of the SARS-CoV-2 virus virus carriers show no ...
Franck Dernoncourt's user avatar
4 votes
1 answer
131 views

Would symptoms differ from eating virus contaminated food versus breathing in virus?

Would symptoms differ from eating virus contaminated food versus breathing in virus? Would symptoms be a good indicator where the virus is located? The COVID-19 causes respiratory symptoms and I guess ...
Jossi's user avatar
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3 votes
4 answers
275 views

Why are Novel Coronavirus anitbody tests disparaged?

The Novel Coronavirus antibody test has been around since February 2020 when it was invented at a Chinese University. It can measure both IgM to show infection in progress and IgG to indicate full ...
WinEunuuchs2Unix's user avatar
2 votes
1 answer
318 views

Details on "Health Impact Events" on V-safe Active Surveillance for COVID-19 Vaccines

Some dubious websites (which I won't link) are claiming that COVID-19 vaccine caused disabilities in more than 3.000 people. As a support of this claim, they cite the table "V-safe Active ...
user38141's user avatar
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9 votes
5 answers
374 views

Which DIY mask is most effective?

There have been a number of do-it-yourself (DIY) mask designs released and tested by both universities and other institutions on account of world wide Personal Protection Equipment (PPE) shortages. ...
Graham Chiu's user avatar
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5 votes
2 answers
121 views

Is the day-of-week variance in COVID-19 case numbers a well-established phenomenon?

Right now (April 27), the JHU data on new COVID-19 cases in the US show a very distinct weekly rhythm; reports are lowest on the weekends and peak in mid-week. This isn't at all surprising — any ...
Steven Stadnicki's user avatar
5 votes
6 answers
405 views

Why don't we take a random sample of the population to estimate the amount of COVID-19 cases?

Current statistics on number of cases will always be a few days behind reality due to the time between infection and going to get tested, asymptomatic people, etc. But why not take a random sample of ...
Nikhil Murali's user avatar
4 votes
3 answers
216 views

Is there a benefit of a COVID-19 vaccination if one had COVID-19 before?

I see the clear benefit of the vaccination if one didn't have the disease. However, there are a lot of people who had the disease already. So I assume they also have the anti-bodies? Or is this a ...
Martin Thoma's user avatar
4 votes
1 answer
93 views

What data is there for physicians to advise patients taking Ace Inhibitors during the COVID-19 pandemic?

Angiotensin-converting enzyme 2 (ACE2) is a membrane-bound aminopeptidase that has a vital role in the cardiovascular and immune systems4. ACE2 is involved in heart function and the development of ...
Graham Chiu's user avatar
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14 votes
6 answers
2k views

Will COVID-19 survivors develop immunity from future infections?

For this question, assume that the virus does not mutate. Can survivors be expected to develop immunity? Why or why not (what is the thought process)? The CDC FAQ indicates that they do not know: Q: ...
gatorback's user avatar
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7 votes
2 answers
725 views

What is the expected false positives/negatives for COVID-19 tests?

As of March 13, 45/301 people have tested positive/negative for COVID-19 in Florida. What is the expected false positives/negatives here? UPDATE (March 14): 71/478 from what I consider the best ...
bobuhito's user avatar
  • 261
7 votes
1 answer
83 views

COVID-19 vaccination second doses: why two doses and why the specified interval?

Certain COVID-19 vaccines such as the Pfizer BioNTech and Moderna are specified to be administered in two doses separated by a 21 and 28 day interval, respectively. My questions are: Why administered ...
Anthony X's user avatar
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6 votes
1 answer
256 views

Why were so many Covid-19 negative tests among close contacts of the early Chinese cases?

In an ECDC report from Jan 17, it is said that In China, 763 close contacts have been identified and monitored. Of these, 644 have completed the observation period, while 119 remain under medical ...
got trolled too much this week's user avatar
5 votes
2 answers
128 views

Why is the reported number of COVID-19 deaths lower on Sundays and Mondays in the US?

I was looking at the Daily Deaths from COVID-19 from Worldometers and I noticed that the number is always lower on Sundays and Mondays. Why is that? Am I interpreting the graphs correctly?
CuriousPaul's user avatar
3 votes
2 answers
469 views

Why it's said a coronavirus vaccine wont be ready for using in 12-18 months when for the H1N1 2009 outbreak there were vaccines available in 6 months?

From different sources we hear that a coronavirus vaccine might be ready in weeks / April / 3 months, but that they would require testing and mass production and it won't be ready to use until 12/18 ...
Pablo's user avatar
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3 votes
1 answer
182 views

Would a COVID-19 controlled burn facilitate herd immunity?

In forest management, a controlled burn is “used for hazard reduction [to] decrease the likelihood of serious hotter fires” [W]. In backfiring strategy, “firefighters attempt to halt the advance of a ...
bjornte's user avatar
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3 votes
2 answers
197 views

Why will COVID-19 last for 12 to 18 months?

In this YouTube video min 0:32, Dr. Samir Gupta, says It typically would last for 12 to 18 months In How the Pandemic Will End in the ll. The Endgame section: No matter which strategy is ...
I likeThatMeow's user avatar
3 votes
1 answer
104 views

Is the code from the mRNA vaccine executed by the cells as a one-off? [closed]

Is the code from the mRNA vaccine executed by the cell that has taken it up as a one-off or does the cell produce the spike proteins endlessly (like a programming loop) until the cell is killed by the ...
Lukasz Korzybski's user avatar
3 votes
1 answer
109 views

What is known about transmission of coronaviruses through food?

I've seen a lot data about COVID-19 virus (SARS-CoV-2) on dry surfaces. But what about wet mediums, in particular food? In the West, it's easy enough to disinfect supermarket packages (before opening ...
got trolled too much this week's user avatar
2 votes
2 answers
128 views

Is it possible to get Covid-19 and have 0 symptoms along the complete journey and hence cure by yourself without knowing?

In this link, in the section How long is it between when a person is exposed to the virus and when they start showing symptoms? mentions Recently published research found that on average, the time ...
I likeThatMeow's user avatar
2 votes
1 answer
60 views

what does 95% effectivenes mean for vaccines (covid) [duplicate]

Often we see in news they say AstraZeneca is 95% effective, while Chinese vaccine is 50%. I have question how to interpret these numbers. Does this mean that if you get vaccinated with AstraZeneca ...
daveBeginner's user avatar
1 vote
1 answer
81 views

How extensive is the US Govt machine readable dataset on covid-19

How extensive is the US Govt machine readable dataset on covid-19 and where can I find this data?
1 vote
2 answers
185 views

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 ...
Roy's user avatar
  • 77
0 votes
1 answer
89 views

Alternatives other than face-mask-respirators for protection against COVID-19 [closed]

Could someone please tell me if these alternatives can also protect one against being infected by COVID-19 virus, when being outside (in grocery stores, markets, etc)? If yes, how much of protection ...
I likeThatMeow's user avatar
0 votes
1 answer
227 views

Do vaccinated people not have zero risk of mortality by Covid 19?

This video by Vox says people who are vaccinated have zero risk of mortality by Covid 19. But NDTV reports (at 00:21 and again at 07:53 in the video) that even fully vaccinated 8 frontline medical ...
user avatar
0 votes
1 answer
40 views

Important thresholds in the number of postive cases of COVID-19 per capita

What are some important quantitative thresholds on the charts tracking the number of positive cases of COVID-19? I've been monitoring the number of positive cases of COVID-19 for a couple years now, ...
Michael Altfield's user avatar
-2 votes
1 answer
70 views

What's the best time of year to purposely contract COVID? [closed]

Before the vaccine for German measles was available, girls were encouraged to expose themselves to a friend or acquaintance who had the disease, to acquire immunity, so that they would not end up ...
aparente001's user avatar
-4 votes
1 answer
1k views

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 ...
user57467's user avatar
14 votes
4 answers
9k views

Why use a placebo in some potential COVID-19 vaccine trials?

With potential COVID-19 vaccine trials beginning around the globe, one vaccine approach is to induce the creation of antibodies in the participants. The first phase of the trial will check whether ...
pymekrolimus's user avatar
12 votes
5 answers
433 views

Does Ivermectin treat COVID-19 coronavirus infection?

Does the anti-parasitic Ivermectin work in actual human studies versus the Petri dish in vitro studies, when treating coronavirus COVID-19 infection? And if so, is it safe in humans? An in vitro ...
Henry Wei's user avatar
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10 votes
2 answers
12k views

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 ...
Toc's user avatar
  • 227
10 votes
2 answers
161 views

Are there diseases for which infection does not grant lasting immunity but a vaccine does?

There has been a lot of discussion about whether people who have COVID-19 and recover will have long-lasting immunity. At the same time, work is underway to create a vaccine for this disease. But if ...
BrenBarn's user avatar
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9 votes
3 answers
344 views

What data and research is available on the mortality risk (infection fatality rate) of COVID-19?

Given controversy and confusion over aspects of COVID-19, particularly over comparisons and contrasts with the mortality risk of seasonal flu, this question seeks data and findings on the mortality ...
9 votes
1 answer
620 views

Is there any identified policy China is doing to successfully reduce COVID-19 the other countries aren't using?

Over the last days (beginning of March 2020), active cases of COVID-19 from China have dropped at a rate of 1,000-2,000 per day. China is the only country which seems able to reduce the amount of ...
Pablo's user avatar
  • 1,105
9 votes
0 answers
173 views

Is there any figure about the accuracy of COVID-19 tests? [duplicate]

Recently I saw the local media (Romania) presenting a case that was initially considered COVID-19 positive and two subsequent tests led to negative results. As far as I know no official bothered to ...
Alexei's user avatar
  • 241
8 votes
1 answer
189 views

Does viral load of the initial COVID-19 infection affect its severity?

If someone gets infected by a droplet containing a high load of the SARS-CoV-2 virus would he be more likely to develop more severe symptoms compared to someone who gets infected by a droplet ...
I M's user avatar
  • 181
8 votes
1 answer
285 views

How is Lopinavir + Ritonavir expected to stop COVID-19?

There are four drugs being tested for effectiveness against COVID-19 in the SOLIDARITY trial. Three of them have obvious potential mechanisms of action: Remdesivir is an RNA polymerase inhibitor. ...
Mark's user avatar
  • 2,055
5 votes
0 answers
227 views

What is a sophisticated estimate of the 2019-nCoV fatality rate?

I've read through this Q&A: Is the mortality rate of 2019-nCoV 41%? My understanding from reading that Q&A is that in the early phase of an outbreak, there are two naive ways to estimate ...
Mick's user avatar
  • 101
5 votes
1 answer
463 views

Do we have scientific evidence of immunity to SARS-CoV-2 at all? [closed]

There is still no scientific evidence of immunity to SARS-CoV-2, the novel coronavirus. The serious virologist say: “We don’t know yet “ ... “we can’t say “ “we hope “ “ we assume “ HILLARY ...
Albrecht Hügli's user avatar
5 votes
1 answer
95 views

Would facemasks reduce virus transmisions in vulnerable populations?

The US surgeon general has asked (tweeted) the public to not buy face masks, because the claim is that healthcare workers need them more. CDC does recommend: Facemasks should be used by people ...
gatorback's user avatar
  • 827
4 votes
5 answers
233 views

Where to find a database containing COVID-19 information?

Is there any global database that enables the stochastic analysis of questions such as age distribution of fatalities, etc? A Google search produced only a WHO article database: https://www.who.int/...
gatorback's user avatar
  • 827
4 votes
1 answer
273 views

What would count as definitive proof that humans can develop COVID-19 immunity?

There are currently numerous debates over whether or not people who have recovered from COVID-19 develop immunity to the disease. By the standards of the the scientific community, what kind of proof ...
JonathanReez's user avatar
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