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.
Survival rates of a mouse model immunized with traditional vaccines after challenge with serogroup D strains. All mice were intraperitoneally challenged with (a) 8 LD50 of strain PM-15, (b) 10 LD50 of strain PM-15, or (c) 25 LD50 of strain PM-10. The mice were observed for 14 days after the challenge.
