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Originally Posted by jfman
I can see Boris and his appeal for home workers to go back to the office falling on deaf ears.
---------- Post added at 18:12 ---------- Previous post was at 17:06 ----------
https://www.theguardian.com/world/20...study-suggests
Oh dear...
“Another nail in the coffin for herd immunity” |
"Herd immunity" ISN'T specific to Covid-19.
Is this the reason for those results?
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Upon exposure to infectious organisms or vaccines, our immune systems quickly produce IgM and IgA antibodies, which are the earliest antibodies seen after infection or vaccination. Within weeks, the immune system begins to produce IgG antibodies. IgA and IgM antibodies are short acting and break down within a few weeks to months. IgG antibodies are long lasting, in most cases lasting for life.
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The primary immune response occurs when an antigen comes in contact to the immune system for the first time. During this time the immune system has to learn to recognize antigen and how to make antibody against it and eventually produce memory lymphocytes.
The secondary immune response occurs when the second time (3rd, 4th, etc.) the person is exposed to the same antigen. At this point immunological memory has been established and the immune system can start making antibodies immediately.
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During the first encounter with a virus, a primary antibody response occurs. IgM antibody appears first, followed by IgA on mucosal surfaces or IgG in the serum. The IgG antibody is the major antibody of the response and is very stable, with a half-life of 7 to 21 days. When an infection occurs with the same or a similar virus, a rapid antibody response occurs that is called the secondary antibody response.
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An increase in the required IgG antibodies occurs with a subsequent infection. The immune system "memorises" the required antibody and produces it
when needed.
In other words, a reduction is perfectly NORMAL.