[1] Univ Colombo, Fac Med, Dept Parasitol, Colombo, Sri Lanka
[2] Univ Sao Paulo, Inst Biomed Sci, Sao Paulo, Brazil
[3] Univ Copenhagen, Ctr Med Parasitol, Dept Int Hlth Immunol & Microbiol, Copenhagen, Denmark
[4] Rigshosp, Dept Clin Microbiol, Copenhagen Univ Hosp, DK-2100 Copenhagen, Denmark
[5] Rigshosp, Dept Infect Dis, Copenhagen Univ Hosp, DK-2100 Copenhagen, Denmark
[6] Univ Peradeniya, Dept Zool, Peradeniya, Sri Lanka
[7] Int Water Management Inst, New Delhi, India
[8] Minist Hlth, Colombo, Sri Lanka
[9] Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA
[10] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA