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¦.
Hepatitis A-boost with a single dose of hepatitis A vaccine 6 months to 36 months later for long term protection. Typhoid-re-immunize with a single dose of Typh-I vaccine every 3 years. HA-Typh-I vaccine can be used after 3 years if boosters are needed for both hepatitis A and typhoid.Refer to Vaccine Administration Practices in Part 1 for additional information.yphoid-re-immunize with a single dose of Typh-I vaccine every 3 years. HA-Typh-I vaccine can be used after 3 years if boosters are needed for both hepatitis A and typhoid. Refer to Vaccine Administration Practices in Part 1 for additional information.