The Honduran president, Juan Orlando Hernández, and his wife, Ana García, tested positive for the coronavirus, the president announced Tuesday in a press appearance.
Some 2.5 million Salvadorans, 2.7 million Guatemalans and one million Hondurans live in the United States and send remittances to their families every month.
The crisis caused by COVID-19 is potentially devastating for the Central American isthmus, whose income depends largely on tourism, and governments are studying measures to mitigate the blow.
The first countries to see the presence of huanglongbing were Belize and Honduras in 2009. In 2010 it spread to Guatemala and Nicaragua, and in 2011 it arrived in Costa Rica.
Amnesty International said the deployment of armed police and military personnel in front of the legislature brought back memories of the darkest moments in El Salvador's history.