The tigers were immediately treated with antibiotics, antihistamines, anti-inflammatory drugs and multivitamins. They were getting better after 10-12 days, and have now recovered under close observation at Jakarta's Ragunan Zoo.
"Their condition is good now. Their appetite has returned and they're being active," Marsitawati said.
Sumatran tigers are the most critically endangered tiger subspecies and are under increasing pressure as their jungle habitat shrinks.
Marsitawati said the Jakarta government is trying to find out how the tigers were infected, because the zoo has been closed as part of coronavirus restrictions. There was no infection among the caretakers and other zoo staff, she said.
Indonesia has become Asia's hot spot with a record number of coronavirus cases in the region.