13,201
Participants
Start Date
January 31, 2004
Primary Completion Date
March 31, 2014
Study Completion Date
March 31, 2014
Nasopharyngeal Swab
Nasopharyngeal Swab
First Affiliated Hospital, Shantou
The University of Hong Kong
OTHER
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
St. Jude Children's Research Hospital
OTHER