TY - JOUR AU - Valli, Maria Beatrice AU - Selleri, Marina AU - Meschi, Silvia AU - Zaccaro, Paola AU - Vincenti, Donatella AU - Lalle, Eleonora AU - Capobianchi, Maria Rosaria AU - Menzo, Stefano T1 - Hemagglutinin 222 Variants in Pandemic (H1N1) 2009 Virus T2 - Emerging Infectious Disease journal PY - 2011 VL - 17 IS - 4 SP - 749 SN - 1080-6059 AB - KW - Pandemic KW - influenza KW - viruses KW - hemagglutinin KW - evolution KW - D222G KW - letter KW - Italy DO - 10.3201/eid1704.100784 UR - https://wwwnc.cdc.gov/eid/article/17/4/10-0784_article ER - End of Reference