Microbial flora of hands of homemakers

Objectives and methods: Because of increasing concern about antimicrobial resistance in the community, aerobic flora of hands of 224 healthy homemakers in northern Manhattan, New York, were examined. Results: Mean log colony-forming unit counts before and after handwashing were 5.72 and 5.69, respectively, P = .60; mean number of species identified/sample was 3.6 before washing and 3.3 after (P = .02). After handwashing gram-negative bacteria were isolated from 75.1 % of subjects; yeast from 32.9 %; and Staphylococcus aureus from 18.5 %, 1 of which (2.4 %) was oxacillin-resistant. Generally, these community isolates were more sensitive than isolates from inpatients in the local hospital, although community isolates of Pseudomonas aeruginosa were significantly more resistant than inpatient isolates for 4/10 agents tested. Conclusions: Hands of healthy persons in the community were usually colonized with gram-negative bacteria, a single handwash had little impact on microbial counts, and hands of healthy adults may increasingly become one reservoir for antimicrobial resistance.