•     Three nematode species viz., ,Wuchereria bancrofti, Brugia malayi and Brugia timori are the causative agents of lymphatic filariasis. Wuchereria bancrofti is responsible for over 98% of disease burden.

  •     The adult worms are thread like and measure 4-10 cms in length.

  •     They habitat the lymphatic system of man.

  •     The female and male worms mate within the human host and the fertilized female worms liberate thousands of embryos, known as microfilariae.(mf)

  •     According to time of appearance of mf in peripheral blood, they are classified into Nocturnally periodic, Nocturnally Sub Periodic and Diurnally sub periodic traces.

  •     The mf circulating in peripheral blood are ingested by the vector mosquito along with blood meal. Within the mosquito they undergo development and reaches the infective stage in 12-13 days.

  •     The infective stage larvae are transmitted to human host through mosquito bites. Within the human host, the infective stage larvae develop into adult worm.

 

 

Last Updated on:06/05/2014