Questions tagged [virus]

For questions about how viruses influence your health. General questions about viruses are off-topic but might be asked on Biology Stack Exchange; for questions about computer viruses, try Super User or Security Stack Exchange.

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How long does it take for the antibody to disappear?

I saw a news article says; 90 days after the infection with ncov19, several patients had no detectable antibodies in their bloodstream. This seems to be one of their evidence that immunity against ...
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Is it possible to remove HPV from the body by strengthening the immune system?

I saw some content as in the following on the web which says HPV can be removed from body by strengthening the immune system: https://www.cdc.gov/vaccines/pubs/surv-manual/chpt05-hpv.html Most HPV ...
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Have any novel virus or bacteria ever been created by man in the laboratory that we know of?

This question may be off topic for medicine. Let us not consider COVID19. Are there any known man made viruse or bacteria ever created or modified by man that we know of? Bio weapons labs weaponize ...
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How did COVID-19 jump the species barrier?

I am not a medical professional. I also do not have enough knowledge on medicine or biology. But I have been wondering a lot about one question in particular for some time: How did COVID-19 jump the ...
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What makes a person asymptomatic? How does it work?

As someone who's simply asking out of curiosity, I've tried looking into the topic myself, but often times I run into answers with little or no detail on the subject. Sometimes the question is more ...
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How to disinfect ice cream from coronavirus?

It is well known that some ways to remove coronavirus from food are: washing/cleaning it carefully; heating it (e.g. in oven, microwave or a saucepan), at least 70 degrees for at least 5 minutes; ...
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What is the Fatality Rate of the Common Cold?

During COVID-19, we've heard many comparisons between SARS-CoV-2 and the Flu, especially in terms of the case fatality rate (CFR). Currently, the Flu is thought to be around 0.1%, and according to the ...
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Doctor giving nurse advice its okay to visit family during COVID19 pandemic - Is this safe? [closed]

My sister is a nurse in Labor and Delivery and for the past 3 months we have advised her to stay away from our parents (60 and 61) due to the potential risks with COVID-19. Recently the lead doctor ...
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Could suppressing your cough help fight a viral infection like COVID-19?

We know that viral infections colonise the body by reproducing inside of target cells, then releasing the viral payload when the cell dies, which goes on to infect more target cells. We know that a ...
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Has World Health Organization provided nutrition/diet/exercise guidelines to strengthen the human immune system for better responding to COVID-19?

Medical sciences is not my subject but my personal feeling is that: A strengthen immune system can better respond to viruses than a weak immune system. A balanced diet in combination with exercise ...
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Are there any other reasons than mutation that could cause a virus to be able to infect the same person twice?

If you are infected by a virus, and subsequently survive it and get completely rid of the infection, are there any other possible reasons for the same virus to be able to infect you again any time in ...
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Does the blood removed from the body still have immunity?

I know that blood contains white blood cells (which attack pathogens). Suppose we take half a liter of blood out of the body and implant the virus into it. Can the white blood cells in that half a ...
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Do common colds transmit poorly through mouth-to-mouth kisses?

The Guardian (in 2017) chose to highlight this study In 1984, researchers at the University of Wisconsin-Madison decided to investigate one of the best-known ways of catching a cold. They infected ...
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Are there viruses which can spread from humans to animals, but cannot spread from animals to humans? [closed]

It had already been proven that felines can be infected with COVID-19 from exposure to infected humans. However authorities are currently saying that there isn't evidence of the opposite happening - ...
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Why isn't saliva sampling used when sampling for the presence of respiratory diseases?

Previously I've asked a question focused on COVID-19: Why did countries initially presume that detecting COVID-19 requires a deep nasal swab? @Fizz provided the following response: So clearly it was ...
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COVID-19 Contact tracing- Is there any clarity on the duration of “contact”

I was somewhat surprised to hear that contract tracers are instructed to disregard contacts between an known infected person (positive tested) person and their contacts if the duration of a contact is ...
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How is COVID-19 transmission tracked with any accuracy?

I saw this article: New study finds few cases of outdoor transmission of coronavirus in China (and study it is based on). I don't have a science or medical background so maybe this is obvious but how ...
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Why does COVID-19 include dry cough as a symptom rather than a wet cough?

I am not sure if this is the right question in this forum, but since it pertains to medical symptoms usually encountered in patients affected by COVID-19, I am asking this question here. Why in ...
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What are the current statistics of the flu globally since December 2019 until today?

I can only find the current statistics for the US that says "Between 36 million and 51 million people have been stricken with the flu as of March 7, according to the latest CDC data." Source: https://...
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A cheap and easy inactivated vaccine for COVID-19

Suppose a person with COVID-19 coughs into a bag. Let the bag sit in the sun for, say, 72 hours -- so as to make the virus inactive. Could a healthy person breathe in the inactivated virus from the ...
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Are all viruses attenuated by sunlight?

I just heard a viral program on the bbc that corona isn't killed my sunlight. I thought all viruses and bacteria were attenuated an the sun, am i incorrect?
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Is outside food really safe to eat during Covid-19 outbreak?

There are 2 contradicting messages out there that mandate this question: "It may be possible that a person can get COVID-19 by touching a surface or object that has the virus on it and then touching ...
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What's the point of COVID-19 testing (for an individual)? [closed]

I feel I am missing something. If one has COVID-like symptoms, they should self-quarantine, seeking medical care if the symptoms get to a certain point. If one has no symptoms, but came into contact ...
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Are there any epidemiological or laboratory studies on the effectiveness of variolation?

Variolation has been brought up in some circles nowadays as a proposal to deal with the Covid-19 crisis (sometimes by invoking the glorious/revolutionary American past). Looking at the aforementioned ...
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Why is the immune response to RSV so short lived (and what else makes a vaccine for RSV difficult)?

From a Bio SE answer that doesn't delve into details on this (because it was a broad question on all "colds") one can't help but notice that RSV has the shortest antibody persistence listed in that ...
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Is it possible for humans to be resistant to certain viral infections without having specific antibodies in their blood?

Popular understanding of how viruses work split immunity into four categories: Virus doesn't affect humans at all No immunity - will get worst possible infection, seems to be the case with COVID-19 ...
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How can we detect if a person died to COVID-19?

So according to the current data, around 80k people died worldwide to COVID-19. But afaik a big portion of them didn't actually die because of the virus directly, but they instead were infected with ...
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How quickly do viruses multiply within mammal cells? [closed]

Once a virus infects a mammal, how quickly do viral particles multiply within their bodies? In other words, what is the expected doubling time of viral particles once a mammal is infected? If this ...
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Can you recover from COVID-19, and then be reinfected so as to be a danger to other people?

Assuming I've contracted COVID-19 this January and made a full recovery and the antibodies have already left my body again. Now, I come into contact with someone who is sick and I inhale some COVID-19 ...
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If a SARS-CoV-2 asymptomatic infected individual is exposed to a high viral load, could they develop COVID-19 disease?

I would add my own research if I could to respect site rules, but I can't. There are no studies on SARS-CoV-2, all I can find is for SARS-CoV-1 and some Chinese information based studies. My ...
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Other than death, what are the potential long-term health impacts on individuals infected with COVID-19?

There is a lot of concern about deaths resulting from or exacerbated by SARS-CoV-2 infections, but I can find little about the potential long-term health impacts on those who 'recover' (understandably,...
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Could COVID-19 be less “dangerous” by the pass of the time?

Could COVID-19 be less "dangerous" by the pass of the time, say for instance, on August? By dangerous I mean, less aggressive in terms of the symptoms, mortality, less probability of caught the virus,...
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What is the difference between Dry cough, Wet cough, Chesty Cough, Barking cough?

I am doing some research on cough sounds but my background is not health sector and I am facing issues to identify the correct type of cough. I have two doubts : Is chesty cough Wet cough? Is ...
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If someone catches COVID-19 in a country where the number of deaths and new infections are slowing, would their symptoms be milder?

If someone happens to catch COVID-19 when we're on the other side of the curves -- when deaths and new infections are slowing -- would their symptoms somehow be less severe? A milder fever? A ...
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1answer
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Can COVID-19 be damaging lung without showing fever? [closed]

Given that a man of 39 years without underlying health condition, is having chest discomfort and tightness, which is more discomfort during evening and night before fall asleep. He don't have cold and ...
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For best hygiene, should we use hard block/bar soap or bottled soft soap?

The accepted answer in When is hand sanitizer appropriate/sufficient in place of warm water and soap? mentions that you should avoid bar soap yet the link provided no longer says this. I have heard ...
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How do cleaning supplies, such as hand sanitizer or Clorox wipes, kill viruses?

I know that viruses are not living or nonliving things, and thus they cannot be "killed." I was wondering how the viruses would no longer be able to infect people after the application of things like ...
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A study about blood differences and the risk for COVID-19

On healthline it's mentioned a recent study that came out of Wuhan, China; it’s published on a website, but hasn’t yet been reviewed by peers. In the study, scientists looked at the blood types of ...
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What happens to viruses that causes them to die?

It's been said that SARS-CoV-2 can remain on surfaces up to 9 or 10 days. While I read that smallpox can survive out of a host even for years. As much as I know, since viruses are only protein ...
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Is it possible to have coronavirus (covid-19) with minimal to no symptoms whatsoever? [closed]

"The most common symptoms of COVID-19 are fever, tiredness, and dry cough. Some patients may have aches and pains, nasal congestion, runny nose, sore throat or diarrhea." World Health ...
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Does the virus causing COVID-19, the Coronavirus SARS-CoV-2 stop being infectious when it is dry? [closed]

There are studies on the persistence of the SARS-CoV-2 virus on surfaces. These studies aim to find out how long a surface remains infectious to humans. As far as I understand, it is not determined ...
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Is there a virus from which humans can recover, but which doesn't grant long lasting immunity?

Prior to the SARS-CoV-2 epidemic I was under the impression that viruses fall into two categories: Diseases from which you recover and afterwards become fully immune. When reinfected with a mutated ...
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How do we know that the Spanish flu was an influenza? [closed]

Many diseases of the respiratory tract present as having “Flu like symptoms” how do we know that the 1918 Spanish flu was a strain of influenza and not some virus with similar symptoms?
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Efficiency of age-dependent and geographical quarantines?

Most western countries let young people transmit the virus slowly over a period of 1-2 years while keeping the economy in lockdown and letting the old and frail people shop and work together. That ...
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Is it possible that COVID-19 virus exist in a human body, but be absent from samples taken from nose and back of throat?

As specified in this link, COVID-19 tests start with taking samples from the nose or back or throat of people. Based on growth rate of this disease, I thought what if those samples are not positive (...
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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 ...
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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 ...
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Is it less likely to get infected by a second virus while fighting first?

By and large, when a person gets ill with eg. flu, it is sort of assumed at least by many people with no medical background in my vicinity, that the person won't get infected by another virus meantime....
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How can I convert mutation rates into number of infected people?

Yes, the question sound strange. But the fact is that mutation rate, μ, is of often measured in terms of substitutions per nucleotide per cell infection, written as "(s/n/c)". So if I have a ...
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Does bleach have to be diluted to be more effective to kill virus?

This page Bleach claims Bleach is more effective at killing germs when diluted than when used straight out of the bottle. this other page (Spanish) Alcohol and Bleach are more effective against ...