India, Dec. 16 -- Two four-horned antelopes (chausingha) died at the Delhi Zoo last week, with two remaining of them now under quarantine and surveillance. The information has been confirmed by two officials at the zoo, however, the administration did not officially comment.

A zoo official said the deaths - which took place on Thursday and Friday - were unexpected and sudden. However, the possibility of rabies is not being ruled out.

"While one death occurred at the enclosure, a second happened after the antelope was shifted for treatment. Presence of foam at the mouth indicates rabies as a possible cause. However, the postmortem report will confirm the exact reason of the death," the official said.

In 2016, a rabies outbreak was repor...