What is the fine-grained topic of the following text: The Centre for Health Protection (CHP) of the Department of Health is today (February 20) closely monitoring three additional human cases of avian influenza A(H7N9), including one death, in Guizhou, Guangxi and Shandong, and again urged the public to maintain strict personal, food and environmental hygiene both locally and during travel. Only return the topic.
Monitoring of Avian Influenza A(H7N9) cases by the Centre for Health Protection