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¦.
If a booster dose is given 6 months to 1 year after the 1st dose, protection will last 10 years. Hepatitis B vaccination, if given over 6 months, lasts about 5 years. If given in a shorter period (2 months or 3 weeks), cover will only last 1 year and a booster is needed at 1 year for 5 year protection. Meningitis A+C (meningivac) last between 3 and 5 years. (This is different from the vaccine used at school and in college for protection against meningitis strain C, which gives much longer protection.) Rabies vaccination, if 3 doses are received, lasts between 2 and 5 years. Typhoid (as vaccine typhim vi, viatim or hepatyrix) last 3 years. Yellow Fever lasts 10 years.