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In reply to the discussion: My patient caught Covid-19 twice. So long to herd immunity hopes. [View all]PoindexterOglethorpe
(28,493 posts)58. There are many, many different viruses that cause colds and flu.
Generally speaking, each cold or flu you have comes from a different virus. There is some evidence that some of the corona viruses which cause colds can re-infect a person some time after they've gotten and recovered from the previous that-corona-virus-caused-cold.
Rhinoviruses are the main source of colds. Once you recover from one of those, you won't get sick the next time you come up against that specific rhino virus.
Flu viruses are more complicated, but at least some immunity is conferred if you get an then recover from a specific flu virus.
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That's normal. Antibodies are the immediate response; Memory B Cells are the long-term response.
lagomorph777
Jul 2020
#51
Right - we keep seeing the story about antibodies fading, as if it's a disaster.
lagomorph777
Jul 2020
#59
Everyone is talking about a vaccine, but it's not really practical over the next year or so.
Renew Deal
Jul 2020
#63
T cells and Memory B Cells are important long-term; antobodies are always short-term protection.
lagomorph777
Jul 2020
#52
That is the issue with people who continue to test positive but are asymptomatic.
Chemisse
Jul 2020
#36
Strong vaccines sound worrisome because that really bad immune response is deadly
soothsayer
Jul 2020
#35
Got sick and then infected again 2 months later? Is it possible it was from a new mutated strain?
Baclava
Jul 2020
#49
There will always be some people with poor immune response. Too soon to say everybody is like that.
lagomorph777
Jul 2020
#50
The problem with the cold is that it's many different viruses; some of them are coronaviruses.
lagomorph777
Jul 2020
#60