secondary attack rate References Quizzes 44 Questions from Britannica’s Most Popular Health and Medicine Quizzes secondary attack rate pathology Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: influenza pandemic (H1N1) of 2009/ Symptoms and transmission…which is known as the secondary attack rate, was higher for H1N1 flu than for seasonal influenza. (The typical secondary attack rate of seasonal influenza is between 5 and 15 percent.) Read More…which is known as the secondary attack rate, was higher for H1N1 flu than for seasonal influenza. (The typical secondary attack rate of seasonal influenza is between 5 and 15 percent.) Read More