Geographical Distribution of Tick Borne Encephalitis in Mongolia
- VernacularTitle:Монгол улс дахü хачигт энцефалитийн газарзүйн тархалт
- Author:
Uyanga B
1
,
2
;
Uranshagai N
1
;
Burmaajav B
2
,
3
;
Undraa B
1
;
Tserennorov D
1
;
Tsogbadrakh N
1
Author Information
1. National Center for Zoonotic diseases
2. Ach Medical University
3. Mongolian Academy of Medical Sciences
- Publication Type:Journal Article
- Keywords:
Tick-borne encephalitis;
tick infection;
seroprevalence;
landscape range;
Mongolia
- From:Mongolian Medical Sciences
2020;191(1):50-56
- CountryMongolia
- Language:Mongolian
-
Abstract:
Background:Medical geography deals with the application of major concepts and theories derived from human and
physical geography to issues of health and disease. Between1970-1980, Russian scientists were first
figured landscape, geographical distribution of TBE in Mongolia. Since human cases of TBD were
registered from 2005, around 2000 cases of TBD were registered. From 15% of diseases and 78%
of fatal cases were tick-borne encephalitis. Therefore, were tried to create current geographical
distribution of TBE in Mongolia and detect risk areas.
Мaterials and Methods:287 TBE cases data, information of TBE positive tick and human data were analyzed which registered
in NCZD between 2005-2017. Arc GIS 9 were used for create map. Mongolian map was divided by 5
landscape range such as forest-taiga, forest-steppe, steppe, steppe-desert, gobi and high mountain.
Result:In forest-taiga range, 57% of TBE cases and incidence was 9.51 per 10000 population. 56.4%
of I.persulcatus tick, 1.9% of D.nuttalli tick were found and infection rate of tick was Ixodes
persulcatus-6.97%, Dermacentor nuttalli-5.2%. Seroprevalence of TBE was 25±12.1 among
population.
In forest-steppe range, 40% of TBE cases and incidence was 0.56 per 10000 population. 43.6% of
I.persulcatus tick, 44.3% of D.nuttalli, 24.4% of D.silvarum tick tick were found and infection rate of
tick was Ixodes persulcatus-3.08%, D.silvarum-1.56% and D.nuttalli-1.56%. Seroprevalence of TBE
was 14.5±11 among population.
In steppe range, 0.7% of TBE cases and incidence was 0.12 per 10000 population. 62.2% of
D.silvarum tick, 23.9% of D.nuttalli tick were found and infection rate of tick was D.nuttalli-2.81% and
D.silvarum-1.2%. Seroprevalence of TBE was 16.3±6.5 among population.
In other range including steppe-desert, gobi and high mountain, 2.8% of TBE cases and incidence
was 0.1-0.27 per 10000 population. 62.2% of D.silvarum tick, 47.6% of D.nuttalli tick were found and
infection rate of tick was D.nuttalli-0.84%. Seroprevalence of TBE was 2.5-13.1 among population.
Conclusion:Natural foci of tick-borne encephalitis have been registered in all landscape ranges of Mongolia and
higher risk area of those ranges were forest-taiga and forest-steppe.
Dermacentor silvarum, Dermacentor nuttalli tick becoming dominant vector of TBE in steppe range.
- Full text:2020-191(1)-50-56.pdf
