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.
This graph represents 135 documents in both the peer-reviewed and grey literature. Reports from parasitology courses field trips and microbiology social service were excluded from this analysis.
