Volume 23, Number 5—May 2017
Research Letter
Vertical Transmission of Zika Virus by Aedes aegypti and Ae. albopictus Mosquitoes
Table
Vertical transmission of Zika virus in Aedes spp. mosquitoes*
Species/ population | Zika virus strain | Cycle | Blood meal titer, log10 PFU/mL | % Infected (diss)† | Mean body titer, log10 PFU/mL | Total no. pools | No. individual mosquitoes | dpi | Zika virus positive | FIR‡ (95% CI) |
---|---|---|---|---|---|---|---|---|---|---|
Ae. aegypti | ||||||||||
Mexico | ZIKV HND | All§ | 8.9 | 90.9 (95.0) | 7.6 | 26 | 130 | 11–18 | 1 | 7.7 (0.5–36.9) |
Argentina | ZIKV HND | All§ | 9.3 | 100 (100) | 6.6 | 28 | 136 | 11–38 | 2 | 14.9 (2.7–8.3) |
Combined¶ | ZIKV HND | OV2 | 29 | 141 | 11–22 | 1 | 7.1 (0.4–4.0) | |||
OV3 | 23 | 115 | 18–38 | 2 | 17.7 (3.2–57.2) | |||||
OV4 | 2 | 10 | 38 | 0 | <94.6 (6.6–495.8) | |||||
Combined¶ | ZIKV HND | All§ | 9.1# | 95.5 (97.5) | 7.4 | 54 | 266 | 11–38 | 3 | 11.5 (3.0–30.8) |
Argentina | ZIKV PR | OV1 | 24 | 120 | 36–38 | 2 | 17.0 (3.1–54.8) | |||
OV2 | 15 | 75 | 43–52 | 0 | <13.3 (0.8–63.6) | |||||
OV3 | 4 | 18 | 60–62 | 0 | <55.8 (3.4–262.5) | |||||
OV4 | 7 | 35 | 63 | 1 | 28.5 (1.7–34.8) | |||||
ZIKV PR | All§ | 9.1 | 100 (100) | 7.7 | 50 | 248 | 36–63 | 3 | 12.3 (3.3–33) | |
Combined |
Combined** |
All§ |
9.1# |
96.9 (98.3) |
7.5 |
104 |
514 |
11–63 |
6 |
11.9
(4.9–4.6) |
Ae. albopictus | ||||||||||
New York | ZIKV HND | All§ | 8.9 | 100 (93.3) | 7.1 | 17 | 85 | 11–63 | 1 | 11.8 (0.7–56.2) |
*Diss, disseminated; dpi, days post infection; FIR, filial infection rate; ZIKV HND, Zika virus Honduras 2016; OV, oviposition; ZIKV PR, Zika virus Puerto Rico.
†Percentage of infected with Zika virus–positive legs.
‡No. Zika virus positive/1,000 larvae.
§Combines data from all hatched eggs.
¶Data for both mosquito populations are combined.
#Mean titer.
**Data for both virus strains are combined.