In February, Biden’s campaign spend $13.1 million, compared to $45.8 million spent by Sanders. His campaign manager said this week he was reassessing his bid.

The presidential race has changed dramatically since February, however, as a deadly coronavirus outbreak has led campaigns to suspend rallies and fundraisers.

The outbreak is also causing swaths of the U.S. economy to shut down as state and local officials order businesses closed and, increasingly, people to stay in their homes.

The outbreak could lead campaigns to rely more on television and digital advertising.

Biden spent only around $5 million on ads in February, compared to more than $26 million spent by Sanders.