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Table 1 Trypanosome infection rates in teneral and non-teneral flies. Flies (Glossina morsitans morsitans) were fed two T. b. brucei clones F1G2 and F1R1 (1) together on their first bloodmeal as tenerals (newly-emerged flies), or (2) together on day 18 as non-tenerals, or (3) and (4) sequentially 18 days apart, as shown in Fig. 1. Midguts and salivary glands (SG) were scored for the presence of each clone by colour of fluorescence. Asterisks indicate that yellow hybrid trypanosomes were observed in these SG infections. TI is the transmission index (percentage of infected midguts that established SG infection)

From: Dynamics of gamete production and mating in the parasitic protist Trypanosoma brucei

Infection regime Midguts Salivary glands
Infection rate Trypanosomes present TI Trypanosomes present
Both F1G2 F1R1 Both F1G2 F1R1
1 Teneral F1G2 + F1R1 on day 0 100 % (28/28) 100 % (28/28) 0 % (0/28) 0 % (0/28) 32 % (9/28) 44 % (4/9)* 56 % (5/9) 0 % (0/9)
2 Non-teneral F1G2 + F1R1 on day 18 49 % (18/37) 83 % (15/18) 6 % (1/18) 11 % (2/18) 22 % (4/18) 25 % (1/4)* 75 % (3/4) 0 % (0/4)
3 Sequential F1G2 on day 0, F1R1 on day 18 89 % (34/38) 6 % (2/34) 91 % (31/34) 3 % (1/34) 47 % (16/34) 0 % (0/16) 100 % (16/16) 0 % (0/16)
4 Sequential F1R1 on day 0, F1G2 on day 18 95 % (35/37) 9 % (3/35) 3 % (1/35) 89 % (31/35) 20 % (7/35) 0 % (0/7) 14 % (1/7) 86 % (6/7)