Table 3.

Secondary attack rate among contacts of primary pneumonic plague cases, Yulong County, China, October 2005

Contact with PPP* patients	Total	Cases	Attack rate (%)
Driver and passengers in truck with PPP patient on Oct 27	4	4	100
Family members†	14	1	7.1
Other villagers with known contact	34	0	0
Medical staff who attended the PPP patients	153	0	0
Other villagers with no recent contact	186	0	0

^*PPP = primary pneumonic plague.

^†Included mother of the first PPP patient who also rode in the truck with him.