Nevertheless, the retention of influenza strains in pigs after these strains have disappeared from the human population might make pigs a reservoir where influenza viruses could persist, later emerging to reinfect humans once human immunity to these strains has waned.
32.
"If you install anti-virus software, " but do not cut off the ability to share files while each individual computer is disinfected, the program " continually attempts to reinfect " computers in the network, he said.
33.
This email in fact could be considered some kind of virus as it has the normal life cycle of a computer virus : It comes through user mailboxes, harms the system ( by deleting a file ), after which the message is forwarded to multiple recipients to reinfect them.
34.
Anthrax is relatively uncommon in U . S . residents because livestock are often vaccinated against the disease, but it persists at low levels because the bacteria can lie dormant in soil for very long periods and subsequently reinfect vulnerable stock and unvaccinated wild animals such as white-tailed deer.
35.
Anton de Bary later conducted experiments to observe the beliefs of the European farmers regarding the relationship between the rust and barberry plants, and after successful attempts to connect the basidiospores of the basidia stage to barberry, he also identified that the aeciospores in the aecia stage reinfect the wheat host.
36.
When athlete's foot fungus or infested skin particles spread to one's environment ( such as to clothes, shoes, bathroom, etc . ) whether through scratching, falling, or rubbing off, not only can they infect other people, they can also reinfect ( or further infect ) the host they came from.
37.
"If a pathogen is on the skin a long time, the person has probably developed immunity to it, " he said, " and the same holds true for an infection from which a person is recovering, so it is difficult to ` reinfect'yourself unless it is a totally different organism, a new germ ."
