Table 1. Epidemiological characteristics of the patients.

	Cluster (n = 111)	HIV-1 B outside the cluster (n = 1403)
Sampling location
Valencia	105	1029
Alicante or Castellón	6	374
Gender
Male	95	724
Female	2	113
Unknown	14	566
Transmission risk a
MSM	72	515
HT	3	121
IDU	0	85
Unknown	36	682

^a MSM:Men who have sex with men; HT: Heterosexual; IDU: Intravenous drug users.