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Trypanosomes are protozoan parasites of vertebrates that are of medical and veterinary concern. A variety of blood-feeding invertebrates have been identified as vectors, but the role of ticks in trypanosome transmission remains unclear. In this study, we undertook extensive molecular screening for the presence and genetic diversity of trypanosomes in field ticks. Examination of 1089 specimens belonging to 28 tick species from Europe and South America led to the identification of two new trypanosome strains. The prevalence may be as high as 4% in tick species such as the castor bean tick Ixodes...

↓ cleavage residues indicate that the NDV isolates correspond to mesogenic/velogenic pathotypes. Figure 2 Deduced amino acid sequence alignment of F gene sequences of NDV strains isolated from Ethiopia. Names of strains are shown on the left-hand side of the figure. Identification with the reference La Sota (genotype II) vaccine strains is indicated by dots. They indicate the cleavage site of the deduced aa sequence of the F gene. X indicates an ambiguous aa sequence. Abbreviations: Eth, Ethiopia; Chk, chicken. Genetic Distance The Ethiopian NDV isolates have a within-group genetic distance...