A Miami-Dade County mosquito control worker sprays around a home in the Wynwood area of Miami on Aug. 1, 2016.(Alan Diaz / AP)
Larry Smart, a Miami-Dade County mosquito control inspector, uses a fogger to spray pesticide to kill mosquitos in the Wynwood neighborhood as the county fights to control the Zika virus outbreak on Aug. 1, 2016, in Miami, Florida.(Joe Raedle / Getty Images)
Christy Roberts with Harris County Public Health & Environmental Services examines mosquitos collected in a trap in Houston at the Harris County Mosquito Control lab June 2, 2016.(John Mone / AP)
Mosquito Inspector Ron Kolsen with Hillsborough County Mosquito and Aquatic Weed Control demonstrates how a mosquito trap is hung June 21, 2016 in Tampa.(Chris Urso / AP)
Miami-Dade mosquito control worker Carlos Vargas pointing to the Aedes aegypti mosquito larvae at a home in Miami, Florida, on June 7, 2016.(Rhona Wise / AFP/Getty Images)
The Aedes aegypti mosquito can infect humans with the Zika virus when it bites a human.(Sanofi Pasteur, TNS)
Lara, who is less then three months old and was born with microcephaly, is examined by a neurologist at the Pedro I hospital in Campina Grande, Paraiba state, Brazil, on Feb. 12, 2016.(Felipe Dana, AP)
Jose Wesley, who was born with microcephaly and screams uncontrollably for long stretches, is attended to in Bonito, Pernambuco state, Brazil. The Zika virus is drawing worldwide attention to a devastating birth defect that until now has gotten little public notice. Regardless of whether the mosquito-borne virus really causes babies to be born with abnormally small heads, a variety of other conditions can trigger it.(Felipe Dana / AP)
A health workers stands in the Sambadrome spraying insecticide to combat the Aedes aegypti mosquito that transmits the Zika virus in Rio de Janeiro, Brazil, on Jan. 26, 2016.(Leo Correa, AP)
A Zika virus sign is seen at Hartsfield–Jackson Atlanta International Airport on May 9, 2016, in Atlanta.(Mike Stewart, AP)
A city environmental health worker displays literature to be distrubuted to the public on April 14, 2016, in McAllen, Texas.(John Moore, Getty Images)
A neighborhood is sprayed for mosquitos early on April 14, 2016, in McAllen, Texas.(John Moore, Getty Images)
A medical researcher looks at a monitor for the results of blood tests for various diseases, including Zika, at the Gorgas Memorial laboratory in Panama City on Feb. 4, 2016.(Arnulfo Franco, AP)
A representation of the surface of the Zika virus in a handout image from Purdue University.(Kuhn and Rossmann research groups)
Residents are blanketed in a cloud of permethrin as a team from the Puerto Rico department of health sprays the insecticide the neighborhood of Cupey, in San Juan, Puerto Rico.(Allison Shelley / Allison Shelley)
Biologist Manuel Amador, right, catches stray adult mosquitos while entomologist Dr. Roberto Barrea, left, describes new traps that his team is devising in a lab where they are breeding thousands of mosquitos for research at the CDC’s dengue branch in San Juan. The center has become ground zero in the war against the Zika virus in the country.(Allison Shelley / Allison Shelley)
Emeris Canale Morales, 27, walks with her dog Lucy on the family’s compound next to a nearly stagnant canal in the coastal town of Loiza, just east of San Juan in February. Morales is 23 weeks pregnant and has been tested for Zika.(Allison Shelley / Allison Shelley)
A statue stands guard atop a tomb stone at the Villa Palmeras cemetery in the Barrio Obrero neighborhood of San Juan. The cemetery is one of the oldest in the city. Many of the graves feature flower urns that hold rainwater, providing the perfect breeding ground for the mosquito that can carry dengue, chikungunya and Zika viruses.(Allison Shelley / Allison Shelley)
A chemist preparing a formula with graphene, copper powder and other elements at a lab of the Chilean company Grupo Avance in Santiago, Chile, on Feb. 25, 2016. The company said it has discovered an innovative formula that works as a repellent for the Aedes aegypti mosquito that transmits the Zika and dengue viruses.(Sebastian Silva, EPA)
Health authorities with the help of the Cuban army fumigate against the Aedes aegypti mosquito in a street in Havana, on Feb. 23, 2016.(Yamil Lage, AFP/Getty Images)
A member of the Cuban army takes part in the fumigation campaign against the Aedes aegypti mosquito in Havana, Cuba, on Feb. 23, 2016.(Yamil Lage, AFP/Getty Images)
A municipal worker fumigates for the Aedes aegypti mosquito that transmits the Zika virus in the Petare neighborhood of Caracas, Venezuela, on Feb. 12, 2016.(Fernando Llano, AP)
A lab worker holds a vial containing Aedes aegypti mosqitos on Feb. 10, 2016 at the IAEA Laboratories in Seibersdorf near Traiskirchen south of Vienna, Austria.(Helmut Fohringer, AFP/Getty Images)
Aedes aegypti mosqitoes are pictured Feb. 10, 2016, at the IAEA Laboratories in Seibersdorf near Traiskirchen south of Vienna, Austria.(Helmut Fohringer, AFP/Getty Images)
A view through a microscope shows the larvae of the Aedes aegypti mosquito, which transmits the Zika virus, at a laboratory at the National Institute of Health in Bogota, Colombia, on April 26, 2016.(Leonardo Munoz, EPA)
Children pass by an area of standing water, a potential Zika transmitting mosquito breeding site, in San Jose, Costa Rica, on Feb. 2, 2016.(Jeffrey Arguedas, EPA)
Soldiers mobilize to combate the Aedes aegypti mosquito that transmits the Zika virus in Tegucigalpa, Honduras, on Feb. 6, 2016.(Orlando Sierra, AFP/Getty Images)
A reveler stands beneath a mosquito net, as a satirical costume, during Carnival celebrations on Feb. 6, 2016 in Olinda, Brazil.(Mario Tama, Getty Images)
Brazilian Army soldiers distribute flyers with information on how to combat the Aedes aegypti during the “Burial of the Mosquito” carnival block parade in Olinda, Pernambuco state, Brazil, on Feb. 5, 2016. The annual parade teaches residents and tourists about the dangers of the Aedes aegypti and how to combat the mosquitoes.(Felipe Dana / AP)
Young revelers stand around a coffin containing an Aedes aegypti mosquito puppet during the “Burial of the Mosquito” carnival block parade in Olinda, Pernambuco state, Brazil, Feb. 5, 2016.(Felipe Dana / AP)
Health workers inspect a used tire depot for stagnant water that could be potential hatcheries of Aedes aegypti mosquitoes that transmits the Zika virus in Villavicencio, Colombia, Feb. 4, 2016. With more than 20,000 cases confirmed in Colombia and fearing that the virus could affect more than half a million people, the government launched a nationwide prevention campaign.(Fernando Vergara / AP)
Members of Sao Paulo Health Municipality Secretary dressed as mosquitoes promote the campaign ‘More health for the city’ to raise awarness for the fight against the Zika, Dengue and Chikunguna viruses, in Sao Paulo, Brazil, Feb. 4, 2016. The health ministers of 14 Latin American countries on Feb. 3, 2016 agreed on a roadmap to fight the Zika virus, linked in Brazil to a dramatic increase of birth defects.(Sebastiao Moreira / EPA)
A Health Ministry worker fumigates for the Aedes aegypti mosquitoes that transmits the Zika virus at the Oriental Market in Managua, Nicaragua. Worries about the rapid spread of Zika through the hemisphere has prompted officials several Latin American countries to suggest women stop getting pregnant until the crisis has passed.(Inti Ocon / AP)
Alice Vitoria Gomes Bezerra, 3-months-old, who has microcephaly, is held by her mother, Nadja Cristina Gomes Bezerra, on Jan. 31, 2016, in Recife, Brazil.(Mario Tama / Getty Images)
Health ministry personnel fumigate against the Aedes aegypti mosquito, vector of the dengue, Chikungunya and Zika viruses in Tegucigalpa, on February 1, 2016. Honduran President Juan Orlando Hernandez on Friday declared the country on a preventive state of alert due to the Zika virus which in the last 44 days killed a person and infected some 1000.(Orlando Sierra / AFP/Getty Images)
Tainara Lourenco, who is five months pregnant, sits inside her house at a slum in Recife, Brazil on January 29, 2016. Like many of the estimated 400,000 women currently pregnant in Brazil, she can’t afford mosquito repellent. The government has pledged to start providing repellent to low-income women and promises to deploy the Armed Forces to help eliminate Aedes’ breeding places.(Felipe Dana / AP)
Daniele Ferreira dos Santos holds her son Juan Pedro as he undergoes visual exams at the Altino Ventura foundation in Recife, Brazil, on Jan. 28, 2016. Santos was never diagnosed with Zika, but she blames the virus for her son’s defect.(Felipe Dana / AP)
in Managua, Nicaragua, a Health Ministry worker fumigates a classroom Jan. 28, 2016, to combat Aedes aegypti mosquitoes, which transmit the Zika virus.(Inti Ocon / AP)
Members of the Dominican Army post information at a butcher shop Jan. 30, 2016, in Guerra to help raise awareness of the Aedes Aegypti mosquito, transmitter of Zika, dengue fever and other diseases.(Orlando Barria / EPA)
Puerto Rico announced Friday that it has recorded the first Zika-related U.S. death amid an outbreak of the mosquito-borne virus in the U.S. territory.
Health Secretary Ana Rius said the victim is a 70-year-old man from the San Juan metro area who died in late February. The U.S. territory is battling more than 700 Zika cases and seeks federal funds to help prevent an epidemic at a time of worsening economic crisis.
Officials said the unidentified man recovered from initial Zika symptoms, but then developed a condition in which antibodies that formed in reaction to the Zika infection started attacking blood platelet cells. He died after suffering internal bleeding.
Rius said the man died less than 24 hours after seeking help at a health center. She said three other cases of the condition known as severe thrombocytopenia have been reported in Puerto Rico, and that those patients recovered successfully.
Three similar Zika-related deaths also have been recorded in the South American country of Colombia, said Tyler Sharp of the U.S. Centers for Disease Control and Prevention.
Zika-related deaths in adults are considered extremely rare. The virus causes only a mild and brief illness, at worst, in most people. But infections in pregnant women have been linked to a brain defect and fetal deaths, and have become an international public health concern.
There have been 426 cases of Zika reported in the 50 U.S. states — all linked to travel to outbreak areas. But officials think it’s likely some small clusters of Zika infections will occur in the U.S. when mosquito numbers boom.
The virus is spreading quickly across Puerto Rico, where 89 pregnant women are infected with Zika. Rius said all 14 pregnant women who are infected and have given birth have healthy babies.
Nineteen people have been hospitalized in Puerto Rico and at least four are believed to have developed a temporary paralysis condition known as Guillain-Barre because of Zika.
President Barack Obama has requested $1.9 billion in emergency money to fight Zika virus, but Congress has not acted.
Other Caribbean also are struggling with a Zika outbreak. The government of the French Caribbean island of Guadeloupe announced a Zika epidemic on Friday with 2,100 suspected cases.