TY - JOUR AU - Xing, Zheng AU - Cardona, Carol J. T1 - Preexisting Immunity to Pandemic (H1N1) 2009 T2 - Emerging Infectious Disease journal PY - 2009 VL - 15 IS - 11 SP - 1847 SN - 1080-6059 AB - KW - Influenza KW - immunity KW - influenza A pandemic (H1N1) 2009 virus KW - epitopes KW - viruses KW - expedited KW - letter KW - Hong Kong KW - New Caledonia KW - United Kingdom KW - United States KW - Nicaragua DO - 10.3201/eid1511.090685 UR - https://wwwnc.cdc.gov/eid/article/15/11/09-0685_article ER - End of Reference