Effects of Vaccination Against Influenza Administered by Our Hospital: A 3-Year Retrospective Study / 日本農村医学会雑誌

ABSTRACT

To review the outcome of our vaccination program against influenza, an investigation was made into the incidence of this acute infectious disease in our community from 2002 through 2004.Enrolled for this retrospective study were 1) all vaccinated individuals, 2) those who underwent nasal examinations by use of the swab, and 3) patients diagnosed as contracting influenza.The number of those administered with influenza virus vaccines increased year after year during the period under review. Over 70% of them were those aged 65years or above. The mean age of those who caught influenza was 42.9±21.3 in 2002, 34.9±20.4 in 2003 and 45.4±20.2 in 2004. Compared with unvaccinated old people, many unvaccinated young and middle-aged people contracted influenza, but among the vaccinated old people, there were some who came down with the flu.Morbidity was low for the old people whose vaccination rate was high.Therefore, it can be said that vaccination was effective in achieving adequate immunity. Nonetheless, for all the preventive injection, the fact that people of advanced age could be infected should be taken note of.