Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Catalonia 2010 and 2011.* Cold months (November to April) significantly higher incidence than warm months (May to October) for both transmission modes (Table 3).
