A lot, according to a report from Axios, which claims the federal government spent $20 billion in March alone to combat the Zika virus.
The amount is up from $14.4 billion the previous month.
The Centers for Disease Control and Prevention’s (CDC) first report on Zika, published on March 9, revealed that the U.S. spent $2.9 billion on Zika treatment and care during that period, according the report.
The CDC reported that $5.5 billion of the $8.8 billion spent on the disease came from the states, while $4.7 billion came from federal health agencies.
The federal government contributed $2 billion to the states.
The states received an additional $1.6 billion from the federal Department of Defense, according Axios.
Zika is a mosquito-borne virus that has killed more than 3,500 people in the United States.
The outbreak began in the Americas country of Brazil in December 2016 and is spread by the Aedes aegypti mosquito, a species that has spread the disease to at least 22 countries.
The outbreak is spreading at an alarming rate, with the virus currently affecting about 1.8 million people in 20 countries.