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. 2019 Nov 7;9:16274. doi: 10.1038/s41598-019-52822-1

Figure 5.

Figure 5

(a) Transfection and infection of CBPV in honey bees. Injection of pink eye honey bee pupae with PBS (1) and transfection solely with recombinant RNA1 (2) or uncapped recombinant RNA1 and RNA2 (3) resulted in the emergence of healthy-looking adult honey bees at day 21 of development. Transfection of capped recombinant RNA1 and RNA2 (4) and wild type virus suspension (5) resulted in pupal death during the incubation period. (b) First passage of CBPV in honey bee pupae (P1). Injection of the negative control with PBS (6), passaging of honey bee lysates from animals transfected with solely recombinant RNA1 (7), and uncapped recombinant CBPV RNA1 and RNA2 (8) resulted in the emergence of apparently healthy-looking imago at day 21 of development. Passaging of virus progeny from animals transfected with capped recombinant CBPV RNAs (9) and wild type CBPV virus suspensions (10) resulted in pupal death during the incubation period. (c) Topical infection of adult honey bees. Caged honey bees were topically infected with rCBPV or wtCBPV or mock infected using PBS. During the incubation period of 10 days, rCBPV infected bees showed a significantly higher mortality rate compared to wtCBPV infected bees or the negative control. Clinical signs of infection were exclusively observed in the rCBPV group starting at day 7 post infection (see Additional Video File 3).