Figure 4
Concurrent infections with H. contortus and Trypanosoma brucei in Nigerian WAD goats from the humid zone. Animals were segregated into low and high FEC producers as described in the legend to Figure 2. All the animals were treated with an anthelmintic on day 61 to remove the worms and then half of each group (9 goats in each) was infected with 50 × 106 trypanosomes (Tryp +ve, animals infected with T. brucei; No Tryps - control groups not infected with T. brucei)). Seven days later, on d67 all the animals (n=36) were challenged with 3000 L3 of H. contortus. The figure shows (A) that the course of the trypanosome challenge was very similar in both groups irrespective of whether they initially showed high or low FEC, and (B) that those animals that harboured heavy infections with worms initially, were cleared of infection, then infected with trypanosomes and challenged with H. contortus, developed heavier worm burdens compared with similarly treated animals which produced initially only low intensity FEC. The y-axis indicates the value of the mean worm burden of relevant groups. For further details see ref [36].