Dogs are not susceptible to the H5N1 bird flu.
Humans
The swine flu H1N1/09 virus survives as do all viruses, by invading a host to support it and do its work to reproduce. Viruses can not live without a host to infect. That is why some viral diseases have been eliminated by vaccination programs, if everyone is vaccinated, no one becomes a host. Don't let flu viruses survive inside you, get a flu vaccination every year prior to flu season.
To continue to replicate and exist, a flu virus must be in a host animal's cells. They can be grown in cultures (and eggs) for creating vaccines, but need a living host for long term activity and to "live".
Parasite. Parasites feed off of hosts.
Yes. People with Anorexia Nervosa are susceptible to many infections and diseases since they have inadequate nourishment and injury to organs from starvation that causes them to no longer have resistance to even minor infectious diseases like the flu, as well as to secondary conditions that make them unable to fight disease.
Swine flu does not have an affect on the circulatory system. It does affect the Cardiovascular system and puts it under great stress, that's why people with heart disease are more susceptible to it.
Swine flu is a virus and viruses reproduce by injecting it's own DNA into a host cell and then that cell is corrupted and taken over and becomes a flu cell. =]
No, you cannot get the flu directly from air pollution. The flu is caused by the influenza virus, which is transmitted from person to person through respiratory droplets. However, air pollution can weaken the immune system and make individuals more susceptible to respiratory infections, including the flu. Therefore, while pollution doesn't cause the flu, it may increase the risk of contracting it.
Influenza is everywhere there are people and other species that are susceptible to the flu. If this is referring specifically to the H1N1/09 swine flu in 2009 during the pandemic, it did eventually spread to every continent and every country in the world.
The state of the immune system can both improve and get worse during pregnancy, and this varies with the individual.
Yes, a susceptible host is an individual who has little or no immunity to infections caused by a transmitted pathogen. This lack of immunity can result from various factors, including age, health status, or previous exposure to the pathogen. As a result, susceptible hosts are at a higher risk of becoming infected when exposed to infectious agents.