When flu comes home...

This week's New England Journal of Medicine has a study that looks at transmission of H1N1 flu in the household setting. The investigators studied 216 persons with flu (index cases) and their 600 household contacts over a 7-day follow up period. The attack rate for household contacts developing influenza-like illness (ILI) was 10%. The median age of the secondary cases was 14.5 years (median age of all household contacts was 26). Risk of acquiring ILI was age-dependent (compared to adults aged 18-50 years, children 0-4 years had a 3-fold risk, children 5-18 had a 2-fold risk, while the risk for those over 50 years was one-third that of adults under 50 years). The time from onset of symptoms in the index case to onset of symptoms in a secondary case was a median of 2.6 days.


  1. Last week in Maryland, a total of 129 specimens were submitted to the Health Dept. lab for influenza testing. Of these, 6 (5%) were PCR positive. Three were type A (H1N1) 2009 viruses, two were type A (H3) seasonal flu viruses, and one was a flu B. So we have a bit of seasonal flu circulating. I hope everyone has gotten or will get there seasonal flu vaccine. We are requiring all HCW to get vaccinated (or decline) by January 15th.


Post a Comment

Thanks for submitting your comment to the Controversies blog. To reduce spam, all comments will be reviewed by the blog moderator prior to publishing. However, all legitimate comments will be published, whether they agree with or oppose the content of the post.

Most Read Posts (Last 30 Days)