The investigated numbers of TB/HIV co-infection was 31 cases. The investigated rate of the co-infection in TB group was 5.2% (17/329) and 17.3% (14/81) in positive HIV group, the dead rate of TB/HIV patients was 22.6%. The group of the highest risk was intravenous drug users (23/31). The numbers of co-infection focus on 4 districs which have had the greatest number of HIV cases in Lang Son province.
Epidemiologic Studies ; HIV ; tubeculosis

By routine methods of research of National AIDS Committee of Vietnam, the authors described the status of HIV infection in Lang son(1993-1998): Langson is one of five provinces that have had the greatest number of HIV cases in Vietnam. It covered 11/11 districts, was almost in the group of ages from 15 to 45, it took 91,8% in male. The group of the highest risk was intravenous drug users (81,3%). At the same time, we have given some basic proposals to prevent HIV in Langson.
HIV ; Acquired Immunodeficiency Syndrome

Trombiculid “chigger” mites (Acari) are ectoparasites that feed blood on rodents and another animals. A crosssectional survey was conducted in 7 ecosystems of southern Vietnam from 2015 to 2016. Chigger mites were identified with morphological characteristics and assayed by polymerase chain reaction for detection of rickettsiaceae. Overall chigger infestation among rodents was 23.38%. The chigger index among infested rodents was 19.37 and a mean abundance of 4.61. A total of 2,770 chigger mites were identified belonging to 6 species, 3 genera, and 1 family, and pooled into 141 pools (10-20 chiggers per pool). Two pools (1.4%) of the chiggers were positive for Orientia tsutsugamushi. Ricketsia spp. was not detected in any pools of chiggers. Further studies are needed including a larger number and diverse hosts, and environmental factors to assess scrub typhus.