Influenza vaccination and false positive HIV results.

n engl j med 354;13 www.nejm.org march 30, 2006 1422 tions of influenza and should be considered for vaccination.1,2 The genetic diversity of H5N1 influenza strains causing serious human disease is greater than previously recognized. These observations have important implications for vaccine development, since the vaccine strains being developed include A/Vietnam/1194/2004 (in China) and A/Vietnam/1203/2004,3 which belongs to clade 1. Yuelong Shu, Ph.D. State Key Laboratory of Infectious Disease Prevention and Control Beijing 100052, China [email protected]