Safety and Immunogenicity of a First-in-Human Mosquito Saliva Peptide Vaccine

Summary

Background: Mosquitos carry diseases that cause major health problems and death worldwide. The AGS-v vaccine targets proteins in mosquito saliva. This may help prevent many mosquito-borne diseases. It might also reduce the lifespan of the mosquito that bites the vaccinated person. Objective: To see if the AGS-v vaccine is safe in humans and how it affects the immune system. Eligibility: Healthy adults ages 18-50 Design: Participants will be screened another study. Participants will be randomly assigned to get either the vaccine with a booster vaccine, the vaccine without the booster, or a placebo. These are given through a needle in the upper arm. Participants will have visits that include medical history, physical exam, and blood and urine tests: Baseline: They will get the vaccine and be monitored for 2 hours. Follow-up visits 1 and 2 weeks after baseline. Visit 3 weeks after baseline: They will get the booster and be monitored for 2 hours. Follow-up visits 1 and 2 weeks after booster visit. Visit 3-5 weeks after booster visit: This includes mosquito feeding. Mosquitos grown in the lab will be allowed to bite the arm. Blood will be drawn 4 times in the 3 hours after the feeding. Phone follow-up a few days after the mosquito feeding. After the feeding visit, 5 follow-up visits about every 2 months Participants will keep a symptom diary for 7 days after each vaccine. They will record their temperature. They will measure any redness around the injection site. They will document and if possible photograph any mosquito bites they get.

Timeline

Start

2017-02-15

Primary completion

2018-12-28

Completion

2018-12-28

Publications

• Background Peng Z, Yang M, Simons FE. Immunologic mechanisms in mosquito allergy: correlation of skin reactions with specific IgE and IgG antibodies and lymphocyte proliferation response to mosquito antigens. Ann Allergy Asthma Immunol. 1996 Sep;77(3):238-44. doi: 10.1016/S1081-1206(10)63262-0.
• Background Sidjanski S, Vanderberg JP. Delayed migration of Plasmodium sporozoites from the mosquito bite site to the blood. Am J Trop Med Hyg. 1997 Oct;57(4):426-9. doi: 10.4269/ajtmh.1997.57.426.
• Background Ribeiro JM. Role of saliva in blood-feeding by arthropods. Annu Rev Entomol. 1987;32:463-78. doi: 10.1146/annurev.en.32.010187.002335. No abstract available.
• Manning JE, Oliveira F, Coutinho-Abreu IV, Herbert S, Meneses C, Kamhawi S, Baus HA, Han A, Czajkowski L, Rosas LA, Cervantes-Medina A, Athota R, Reed S, Mateja A, Hunsberger S, James E, Pleguezuelos O, Stoloff G, Valenzuela JG, Memoli MJ. Safety and immunogenicity of a mosquito saliva peptide-based vaccine: a randomised, placebo-controlled, double-blind, phase 1 trial. Lancet. 2020 Jun 27;395(10242):1998-2007. doi: 10.1016/S0140-6736(20)31048-5. Epub 2020 Jun 11.

Drugs

Indications