UPDATED: Click here to read our latest article on all three types of Filariasis
645,232 cases of filariasis (both forms) were estimated for the Philippines from 1963 to 1996.
Wuchereria bancrofti
Time and Place:
— Bancroftian filariasis is endemic to southern Luzon, Mindanao, Mindoro, Palawan, Samar, Leyte, Sorsogon and Bohol.
— 43 of 63 provinces were endemic n 1960; 45 of 77 provinces as of 1996 4 ; 290 municipalities as of 2001; 351 of 1,566 municipalities as of 2003; 39 of 79 provinces as of 2004.
— Cases have recently been registered in Marinduque.
— Both forms of filariasis (W. bancrofti and B. malayi) coexist in only four provinces: Davao Oriental, Palawan, Eastern and Northern Samar 6, and Surigao del Sur.
— In 1984, 20 million persons were considered at risk for filariasis (both W. bancrofti and B. malayi) in the Philippines; 23.5 million in 2002; 15,034,765 in 2006; 21,882,581 in 2007.
— Only two provinces (Marinduque and Sulu) were considered ‘high prevalence’ areas (>10%) as of 1993.
Disease in the Philippines is nocturnally periodic.
Prevalence surveys:
37% of males and 17% of females in a village on Cataduanes (microfilaremia, 1978 publication)
13% in Bayanan and 3.4% in Manganan (Mindoro, microfilaremia, 2004 publication)
Vectors:
— The local vectors are Anopheles minimus flavirostris, Aedes poicilius , Culex quinquefasciatus, and Ochlerotatus (Finlaya) niveus.
Brugia malayi
Time and Place:
— Brugia malayi infection is endemic to southwestern Palawan, Sulu, Agusan and Samar.
— Both forms of filariasis (W. bancrofti and B. malayi) coexist in only four provinces: Davao Oriental, Palawan, Eastern Samar, and Surigao del Sur.
— Brugia malayi was first confirmed in the Philippines in 1964 — in Palawan (33.1% local prevalence at the time).
— 43 of 63 provinces were endemic for filariasis in 1960; 45 of 77 provinces as of 1996. 1
— In 1984, 20 million persons were considered at risk for filariasis (both W. bancrofti and B. malayi) in the Philippines.
Vectors:
— The local vectors are Mansonia uniformis, Mansonia bonnea, and Mansonia dives.
— Mansonia dives are associated with both nocturnally periodic and subperiodic microfilaremia patterns on Palawan.
Mass treatment with diethylcarbamazine and albendazole was administered to 1,945,121 persons in 2001.
— 9,881,124 persons received mass treatment in 2005 ; 10,174,936 in 2006; 13,627,661 in 2007
UPDATED: Click here for our latest article on Filariasis
Did you like this article? Find more of our latest content here
Originally published at https://www.gideononline.com.
