Specifically, a virus or bug passed to a pig is considered a huge threat in the medical community, because pigs can pass their diseases onto humans.
The virus cannot live in immunized individuals, nor in nature.
If I knew for a certainty that a man was coming to my house with the conscious design of doing me good, I should run for my life, as from that dry and parching wind of the African deserts called the simoom, which fills the mouth and nose and ears and eyes with dust till you are suffocated, for fear that I should get some of his good done to me--some of its virus mingled with my blood.
The virus began with a cough, headache, fever, aching limbs.
The results clearly shown that there is loss of M M2 receptor function in patients with asthma during a naturally acquired virus infection.