WASHINGTON — President Obama is asking Congress for more than $1.8 billion in emergency funding to fight the Zika virus and the mosquitoes that spread it here and abroad, but says “there shouldn’t be a panic on this.”

The virus is spreading rapidly through Latin America. While most people experience either mild or no symptoms, Zika is suspected of causing a devastating birth defect – babies born with abnormally small heads – and pregnant Americans are urged to avoid travel to affected areas.

U.S. health officials say the money is critical for research into the birth defect known as microcephaly.

They also want to speed development of a vaccine and better diagnostic tests, and expand mosquito control programs. Some of the money would also aid Zika-stricken countries and territories.

“What we now know is that there appears to be some significant risk for pregnant women and women who are thinking about having a baby,” Obama said in an interview aired Monday on “CBS This Morning.”

And while experts don’t expect large outbreaks in the continental United States, the emergency funding also would help them prepare for any local transmission as spring and summer approach.

The administration is seeking the Zika money separately from the regular budget for the next fiscal year, which Obama will submit to Congress on Tuesday.

“For the average American, this is not something that will change our day-to-day life,” Dr. Anne Schuchat of the Centers for Disease Control and Prevention told reporters at a White House briefing. “Our focus is on protecting pregnant women and trying to control the mosquito.”

Most of the money would go to health officials for things such as improving laboratory testing capacity, education and establishing rapid response teams. About $250 million of assistance would be directed specifically to Puerto Rico through extra Medicaid funding for health services, and $200 million would go toward research and commercialization of new vaccines and diagnostic tests.

The remainder, about $335 million, would go to the U.S. Agency for International Development to help affected countries provide training to health workers, stimulate private sector research and help pregnant women gain access to repellent to protect against mosquitoes.

The Pan American Health Organization reports 26 countries and territories in South and Central America and the Caribbean with local Zika transmission.

To date, there has been no transmission of the Zika virus by mosquitoes within the United States, but some American travelers – 50 with laboratory-confirmed cases between December and last week – have returned home with the infection.