Rajendran G, Panicker K N, Krishnamoorthy K, Sabesan S, Radhakrishnan R
Vector Control Research Centre, Indira Nagar, Pondicherry.
J Commun Dis. 1997 Dec;29(4):333-43.
A sample survey using parasitological, clinical and entomological indicators was carried out in all the 18 administrative units of Chavakad taluk, Trichur district, Kerala, India to assess the current filariasis situation. Cluster sampling procedure was followed to screen individuals. Both Wuchereria bancrofti and Brugia malayi species were found to be prevalent in this taluk. Microfilaria (mf) carriers with W. bancrofti were detected in eight areas while B. malayi was recorded only from one area. The two species were found to co-exist in another area. The highest infection rate registered for W. bancrofti was 1.51 while it was 0.3 for B. malayi. Infection due to W. bancrofti constituted 87.88% of the total 33 microfilaria cases. Prevalence of B. malayi was very low. Cases with clinical manifestation of filariasis were recorded in all the four areas surveyed. The present trend in the prevalence of infection (mf) and disease showed a decline in both the species when compared to earlier surveys of 1960s. At least 11 areas are still endemic for filariasis in this taluk. Although prevalence of mf was recorded for the first time in one of the areas viz., Elavalli, the rate was only 0.16%. Entomological surveys revealed the presence of 14 mosquito species, of which Culex quinquefasciatus contributed 84.85% and Mansonia 0.77%. While C. quinquefasciatus was recorded in all the 18 areas, Mansonia spp were found only in 8 areas. Only C. quinquefasciatus was found to harbour different developmental stages of W. bancrofti, with overall infection and infectivity rates of 1.94 and 0.97 respectively. The possible reason for the decline in vector density and infection in man are postulated.
在印度喀拉拉邦特里凡得琅区查瓦卡德乡的所有18个行政单位开展了一项使用寄生虫学、临床和昆虫学指标的抽样调查，以评估当前的丝虫病状况。采用整群抽样程序筛查个体。发现班氏吴策线虫和马来布鲁线虫在该乡均有流行。在八个地区检测到携带班氏吴策线虫的微丝蚴携带者，而仅在一个地区记录到马来布鲁线虫。在另一个地区发现这两种线虫共存。班氏吴策线虫的最高感染率为1.51，而马来布鲁线虫为0.3。在33例微丝蚴病例中，班氏吴策线虫感染占87.88%。马来布鲁线虫的流行率非常低。在所调查的所有四个地区均记录到有丝虫病临床表现的病例。与20世纪60年代的早期调查相比，目前感染（微丝蚴）和疾病的流行趋势显示这两种线虫的感染率均有所下降。在这个乡至少有11个地区仍然是丝虫病流行区。尽管在其中一个地区埃拉瓦利首次记录到微丝蚴流行率，但该率仅为0.16%。昆虫学调查发现有14种蚊子，其中致倦库蚊占84.85%，曼蚊占0.77%。虽然在所有18个地区均记录到致倦库蚊，但仅在8个地区发现曼蚊属。仅发现致倦库蚊携带班氏吴策线虫的不同发育阶段，总体感染率和感染性率分别为1.94和0.97。推测了媒介密度和人类感染率下降的可能原因。
