New York City is sending 1 million condoms to Puerto Rico in an effort to fight the Zika virus.

The condoms are being donated by the New York City Department of Health and will be distributed around Puerto Rico by its health department.

Zika is primarily spread through infected Aedes mosquitoes but can also be spread through sexual contact or blood transfusion.

“New York City has acted aggressively to reduce the overall mosquito population -- while increasing Zika detection methods -- in our ongoing effort to protect residents as well as visitors to our city,” Mayor Bill de Blasio said in a statement. “In light of Puerto Rico’s healthcare crisis, we are proud to announce we’ve donated 1 million condoms to our neighbors, and we will continue our campaign focusing on Zika prevention for pregnant women and international travelers. We stand with the Puerto Rican people.”

On Friday, health officials announced the first U.S. death of a Zika patient in Puerto Rico. In addition to the Zika-related death, Puerto Rico reported 683 confirmed cases of Zika, including 65 pregnant women with symptoms of the virus, the CDC said Friday.

Of the confirmed cases, five patients developed Guillain-Barre syndrome and were hospitalized.

Zika, a virus known to cause the birth defect microcephaly, first began spreading in Puerto Rico in December.