Health officials in Mexico say 16 states are contributing to a nationwide increase in COVID-19 cases. Among those contributing to a possible third wave of the virus is neighboring Sonora.

Mexico’s Director of Epidemiology José Luis Alomía says the number of coronavirus cases has gone up nine percent over the past week. And about half of Mexico’s 32 states are contributing to the incremental uptick.

Sonora is one of them.

Last month, the state was briefly considered at low risk on the federal government’s pandemic risk scale. But quickly returned to moderate risk, where it’s stayed for the past several weeks.

Despite concern that travel during Holy Week could bring on a third wave of the virus in Sonora, there has yet to be a spike in cases.

Mexico will update its risk assessment on Monday, using factors including coronavirus cases, deaths and hospitalizations to determine the level of threat in each state.