(CNN) Planes completed aerial spraying for mosquitoes carrying the Zika virus early Friday in the Miami area, despite concerns over possible effects that the insecticide Naled may have on health and the environment. Florida's health department told The Miami Herald (http://hrld.us/2c1fOBF) that eight out-of-state residents have contracted Zika in Florida but are not included in the state's total count of local Zika infections. The U.S. Centers for Disease Control and Prevention has said it could lift its advisory for a 1-square-mile zone encompassing Miami's Wynwood neighborhood on Sept. 19 if no new locally contracted cases are confirmed, The Miami Herald reports (http://hrld.us/2bZrzIO). The virus can cause neurological disorders in unborn children

Health officials have sprayed pesticide and larvicide on the ground in areas where they believe the mosquitoes may be, and are expanding those efforts with the aerial use of Naled. County Mayor Carlos Gimenez said in a statement Wednesday, Sept. 7 that the spraying to fight the Zika virus scheduled for Thursday morning was moved to Friday morning. Naled spray droplets stay airborne for an extended period, and the chemical begins to break down once exposed to sunlight or water. Mosquitoes, sexual contact with someone infected and contact with infected blood can transmit the virus to humans. The United Kingdom has advised pregnant women to avoid the county for non-essential travel and consider postponing non-essential travel in the rest of Florida. Pregnant women are at greatest risk because the virus can have devastating consequences for an unborn baby, including the birth defect microcephaly and other neurological deficits, as well as miscarriage and stillbirth among women who were infected while pregnant.
Miami Beach authorities begin spraying for the Zika virus despite protests.