It seems to me, and I've stated this for months now, that it is likely that despite all the precautions, the virus is finding it's way about the Globe, which means it's likely EVERY human being alive is exposed, or has been, to small numbers of the virus, not enough to cause full-blown symptoms of illness. When this happens, the body's defenses builds antibodies against that virus, able to eliminate relatively small numbers naturally. This process may explain how the various pandemics eventually became "burned out'. "A quarter of people may already be immune to coronavirus even though many of them have never been infected, a new study by Public Health England (PHE) suggests. Over the past few months, researchers have followed nearly 2,850 key workers from the police, fire and health services to gauge levels of immunity to the virus. They discovered that, by June, one in four had high levels of T-cells which recognised Covid, suggesting they had some level of protection against the virus – but nearly half had never been infected." See: https://frontier.yahoo.com/news/many-could-immune-covid-despite-143426976.html Frank
I didn't look at the link but I have wondered about that. My sister-in-law had it. My brother who lives in the house with her didn't catch it. My niece had it. Her husband didn't catch it. It seems to me that they must have some kind of natural immunity to the virus. I think the researchers would be well advised to test people who have been exposed but didn't have the virus to find out why.
I remember when there were rumors that people with O+ blood type were more immune. Don't know whatever happened with that.
I thought perhaps previous diseases you might have had produced antibodies effective for later diseases as well. Who knows?
Looks like Harvard Med School shot this theory down in July. "The study did find, however, that symptomatic individuals with blood types B and AB who were Rh positive were more likely to test positive for COVID-19, while those with blood type O were less likely to test positive." LINK
That could be true. My son-in-law who is a fireman recently traveled to Texas for a competition and roomed with his fellow fireman for 3 days, who then tested positive when he returned to the station. My SIL then came down with a fever for a couple of days, stayed home, worked outside away from my daughter for a few days, and didn't bother to get tested. She was tested, and it was negative thank the Lord, but she had to be quarantined for ten days, and now they are back to normal. Of course, my g-daughters have not been at school, and do all schoolwork on the computers. I certainly hope the statements above are true. I have O blood type and also have had pneumonia shots and also had encephalitis, which I hope aided me in developing a stronger immunity.
My BFF neighbor last Sunday had her family over. Tuesday her son tested positive..later hat day two tested positive..even the tutor who comes in the house was just diagnosed as positive. Just seems to be getting closer and moving faster.
It seems from all the news the last five decades, especially all year this year, that 50% to 95% of people who get 'infected' with a cold or a flu including so-called covid have NO SYMPTOMS..... regardless if they have immunity or not, totally regardless if they were ever tested or not .... (the tests do not test for actual covid19 , but for things that are common in many people, resulting in a lot of false positives for covid - AND that's besides the SAME tests being re-done the same day come back with the opposite results. There appears to be NO HEALTH REASON for the testing. No matter if tested at all, always do what is right, including as needed vitamin c and d, and other helps.
My wife and I have been supplementing many of the things needed to beef up the immune system for years and they are apparently working., As an extra for me, Ive been immune to mumps and smallpox all my life so I really do not know what else I could be immune to.
There have been some studies on the relationship of age and the severity of symptoms of virus infection, where the data suggests that previous exposure to other viruses may work both ways. In other words, previous infection with some viruses may cause a person to have greater immunity to a new virus, and others can cause a person to have less. That would be something, if true, wouldn't it?
That may happen frequently, actually, the way things go. On the other hand, determining the cause of disease and preventing or reversing/ treating the cause/ is almost always a better idea than finding symptoms and treating symptoms after someone is sick, and not dealing with the cause.