Quasar44
I think that one of the things that makes the coronavirus so contagious (and deadly) is that people have no natural immunity to it. Like they do with the flu. And the flu one one of the diseases brought by Europeans to the Americas that helped wipe out most of the native population.
Totally wrong.
First of all, those under 18 or so seem to all be inherently immune.
Then there are the asymptomatic, which seems to be about half the population, and the have to be inherently immune as well.
People DO have lots of historic exposure to coronaviruses, so this one is not totally new, just a different strain that is heat resistant from living in bats. (Bats get hot when they fly.)
{...
The
history of coronaviruses is a reflection of the discovery of the diseases caused by
coronaviruses and identification of the viruses. It starts with the first report of a new type of
upper-respiratory tract disease among chickens in North Dakota, U.S., in 1931. The causative agent was identified as a virus in 1933. By 1936, the disease and the virus were recognised as unique from other viral disease. They became known as
infectious bronchitis virus (IBV), but later officially renamed as
Avian coronavirus.
A new brain disease of mice (murine
encephalomyelitis) was discovered in 1947 at
Harvard Medical School in Boston. The virus causing the disease was called JHM (after Harvard pathologist
John Howard Mueller). Three years later a new mouse hepatitis was reported from the
National Institute for Medical Research in London. The causative virus was identified as
mouse hepatitis virus (MHV).
[1][2]
In 1961, a virus was obtained from a school boy in
Epsom, England, who was suffering from
common cold. The sample designated B814 was confirmed as novel virus in 1965. New common cold viruses (assigned 229E) collected from medical students at the
University of Chicago were also reported in 1966. Structural analyses of IBV, MHV, B18 and 229E using
transmission electron microscopy revealed that they all belong to the same group of viruses. Making a crucial comparison in 1967,
June Almeida and
David Tyrrell invented the collective name coronavirus, as all those viruses were characterised by
solar corona-like projections (called
spikes) on their surfaces.
[3]
Other coronaviruses have been discovered from pigs, dogs, cats, rodents, cows, horses, camels, Beluga whales, birds and bats. As of 2020, 39 species are described. Bats are found to be the richest source of different species of coronaviruses. All coronaviruses originated from a common ancestor about 293 million years ago.
Zoonotic species such as
Severe acute respiratory syndrome-related coronavirus (
SARS-CoV),
Middle East respiratory syndrome-related coronavirus (
MERS-CoV) and
Severe acute respiratory syndrome-related coronavirus 2 (
SARS-CoV-2), the aetiological agent of the
COVID-19 pandemic.
...}
en.wikipedia.org