New research shows that the Zika virus has two routes by which it can infect a developing fetus, depending on when during a pregnancy the infection occurs. It also shows an existing drug might be able to limit the damage wreaked by the virus.

The new study, by scientists at the University of California at San Francisco and the University of California at Berkeley, suggests that an antibiotic called duramycin seems to be able to block Zika’s ability to latch onto the cells it wants to affect.

“It was day and night. There was either infection or no infection, depending on how much drug you used,” Lenore Pereira, one of two contributing authors of the study, said in an interview.

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