title: Need for more evidence on vaccination.
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000517:prevention & control*; D002415:Cats; D004283:Dog Diseases / Q000517:prevention & control*; D004285:Dogs; D007115:Immunization Schedule; D012449:Safety; D013997:Time Factors; D016896:Treatment Outcome; D014611:Vaccination / Q000009:adverse effects / Q000662:veterinary*