Abstract:

To analyze the epidemiological characteristics of imported ovale malaria in Henan Province during 2010-2016, a database was established by collecting the epidemiological data of ovale malaria through the Infectious Disease Reporting and Management System of China Information System for Disease Control and Prevention in 2010-2016 combined with laboratory re-examination. Results showed that in 2010-2016, 115 ovale malaria cases were reported in Henan Province, which were all imported and accounted for 9.6% of all the imported malaria cases (115/1 203). The constitutional ratio of ovale malaria among imported malaria was 0, 1.4% (2/146), 6.4% (10/156), 13.3% (26/197), 13.9% (30/216), 13.0% (24/184) and 11.6% (23/198) during 2010-2016, respectively. All the 115 cases were from Africa, mainly from Angola (22, 19.1%), Congo (17, 14.8%), Equatorial Guinea (15, 13.0%), Liberia (14, 12.2%) and Nigeria (13, 11.3%). The interval from disease onset to diagnosis ranged from 0 day to 59 days. The rate of correct initial diagnosis with respect to reference laboratory re-examination was 51.3% (59/115). There was no significant difference in the rate of correct initial diagnosis between medical institutions (53.3%, 32/60) and centres for disease control and prevention (49.1%, 27/55) （χ² = 0.21, P > 0.05）, and both were higher than city-level and county-level medical institutions （χ² = 20.80, 6.15; P < 0.05）.

Key words: Imported ovale malaria, Epidemiological characteristics, Henan Province