 [ Symptoms ] do i have hiv  i am a 25 year old male i had protected sex with a asian sex worker at a spa over years ago i ejaculated and i believe the condom slipped off as she continued to ride me for 1   2 minutes anyway this past week i was diagnosed with uretharitis  yeast infection and prescribed diflucan fluconazole now i have a loss of appetite and yellow liquid diarrhea yeast infections and loss of appetite are symptoms of hiv i am scared what are the chances that i got hiv or another std from this [ Disease ] the effectiveness of the flu vaccine is dependent upon the extent of the match between the virus strains used to prepare the vaccine and those viruses in actual circulation the age and health status of the individual also play a role in determining the effectiveness of the vaccine research has shown that when there is a good match between the virus strains chosen for the vaccine and those in circulation the vaccine prevents influenza illness in approximately 70 90 of healthy adults under 65 years of age a study of children from one to 15 years of age showed that inactivated influenza vaccine was 77 91 effective in preventing influenza respiratory illness the effectiveness of the vaccine in preventing respiratory illness in people over 65 years of age is somewhat lower among older people who reside in nursing homes influenza vaccine is most effective in preventing severe illness secondary complications and deaths the vaccine can be 50 60 effective in preventing influenza related hospitalization or pneumonia and 80 effective in preventing influenza related death although the effectiveness in preventing influenza respiratory illness can be as low as from 30 40