Kalina died Tuesday after showing similar symptoms as Nyah, who died on March 19, the zoo said in a statement.
Both Kalina and Nyah tested for high levels of elephant endotheliotropic herpesvirus, or EEHV, which leads to hemorrhagic disease in elephants, according to the zoo.
The zoo said its staff is devastated after the loss of the two beloved animals within days of each other. "Please keep our staff in your thoughts at this difficult time," it said.
The deadly viral infection is commonly found in Asian elephants, and affects the mammoth animals in the wild as well as in sanctuaries and zoos.
There is no vaccine for the virus, and it does not affect humans and other animal species, according to the zoo.
The elephants were two of several at the zoo, and were among the youngest.
Nyah -- the smallest in the herd -- was born on June 28, 2012, while Kalina was born on July 20, 2011.
While it's unclear how many African elephants are left in zoos and sanctuaries, the populations in the wild have plummeted over the years due to poaching.
In 1930, the African continent had about 10 million wild elephants, according to the World Wide Fund. Poaching and conflict have decimated those numbers over the years, with experts estimating there are 415,000 elephants left across Africa, according to the WWF.
"While elephant poaching is trending downward, with significant declines in East Africa, poaching continues to steer the species dangerously nearer to extinction," the WWF said.
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