The other type is virulent (produces disease), is the cause of FIP, and is called feline infectious peritonitis virus (FIPV). It is believed that FIP occurs when FECV mutates to FIPV in the cat and starts to replicate in the cat's cells. What causes this mutation is unknown.he other type is virulent (produces disease), is the cause of FIP, and is called feline infectious peritonitis virus (FIPV). It is believed that FIP occurs when FECV mutates to FIPV in the cat and starts to replicate in the cat's cells. What causes this mutation is unknown.
How long does a typhoid shot last?   According to the CDC website, a booster dose is needed every 2 years for people who remain at risk.. The oral (live) vaccine lasts 5 years before another dose is neededâ¦.
Recently, California passed legislation to allow rabies vaccines at 12 weeks vs. 16 weeks, which caused a lot of controversy and will continue to do so. As to the question of how long rabies vaccines last, according to titer tests, antibodies can remain in an animalâs blood for seven to nine years, and perhaps longer.ecently, California passed legislation to allow rabies vaccines at 12 weeks vs. 16 weeks, which caused a lot of controversy and will continue to do so. As to the question of how long rabies vaccines last, according to titer tests, antibodies can remain in an animalâs blood for seven to nine years, and perhaps longer.