An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Kröger L, Brander E, Korppi M, Wasz-Höckert O, Backman A, Kröger H, Launiala K, Katila ML.Kröger L, et al. Among authors: korppi m.Pediatr Infect Dis J. 1994 Feb;13(2):113-6. doi: 10.1097/00006454-199402000-00007.Pediatr Infect Dis J. 1994.PMID: 8190535