The vet my cats get their routine care at has switched to suggesting intranasal for most routine vaccines in cats. The evidence seems to be that intranasal conv

The vet my cats get their routine care at has switched to suggesting intranasal for most routine vaccines in cats. The evidence seems to be that intranasal conveys a slightly better immunity (possibly by specifically sensitizing the mucous membranes) and avoids the small but well-characterized injection-site sarcoma risk, at the cost of a 30% chance of some minor cold-like side effects for a few days.