Officials at the Centers for Disease Control are calling for cheaper and wider access to birth control because of the outbreak of the Zika virus.
"Because contraception is the primary means to prevent unintended pregnancy for women at risk for Zika virus infection, sexually active nonpregnant women of reproductive age and their sex partners need to have access to all approved contraceptive methods, and these methods need to be readily available and accessible," the CDC said in a report released Tuesday.
On Monday, the agency issued a travel warning to pregnant women not to travel to a small section of Miami where 14 cases of the virus have been found.
The CDC estimates that 41 states are at risk of the two types of Aedes mosquitoes that carry the Zika virus.
In those areas, the report found that 3.5 percent to 15.3 percent of sexually active women aged 15-44 do not use contraception, and fewer than one-third use "highly effective" forms of birth control such as intrauterine devices or a contraceptive shot.
The report says the cost of those contraceptives need to be lowered, saying, "Given low rates of [long-acting reversible contraception] use, states can implement strategies to remove barriers to the access and availability of LARC including high device costs."
The CDC also says birth control must be more widely available to teens who have higher rates of not using contraception.
The Zika virus is highly dangerous to pregnant women as it causes a birth defect called microcephaly, in which a baby is born with an abnormally small head and leads to brain damage.
However, for most people, the virus causes mild, flu-like symptoms.