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Table 2 Relevance of the midgut and salivary glands barriers in Aedes vexans after oral exposure to RVFV 56/74

From: Field-captured Aedes vexans (Meigen, 1830) is a competent vector for Rift Valley fever phlebovirus in Europe

  IR MIB DIR MEB TR SB TE Overall vector competence
Relative importance (%) 14/65 (21.5) +++ 6/14 (42.9) ++ 5/6 (83.3) nulla 5/65 (7.7) Low
  1. aUncertain given the small sample size
  2. Notes: Rating of relative importance of the barrier: null, virus crosses this barrier in >80% of females; +, minor, virus crosses this barrier in 60–80% of females; ++, moderate, virus crosses this barrier in 40–60% of females; +++, severe, virus crosses this barrier in 20–40% of females; ++++, very severe, virus crosses this barrier in < 20% of females [10]
  3. Abbreviations: IR, infection rate; DIR, disseminated infection rate; TR, transmission rate; TE, transmission efficiency; MIB, midgut infection barrier; MEB, midgut escape barrier; SB, salivary gland barrier