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.
The flea digestive tract. (A) Uninfected X. cheopis flea immediately after taking a blood meal, with the midgut filled with fresh blood. (B, C) Digestive tracts dissected from uninfected fleas showing the anatomy of the proventriculus and the simple midgut.
