[1] UNIV OXFORD, DEPT ZOOL, WELLCOME CTR EPIDEMIOL INFECT DIS, OXFORD OX1 3PS, ENGLAND
[2] PAPUA NEW GUINEA INST MED RES, MADANG, PAPUA N GUINEA
[3] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT BIOL, LONDON SW7 2BB, ENGLAND
[4] UNIV EDINBURGH, INST CELL ANIM & POPULAT BIOL, DIV BIOL SCI, EDINBURGH EH9 3JT, MIDLOTHIAN, SCOTLAND