Health officials said on Friday that a school janitor who was recently diagnosed with chikungunya fever caught it in Hong Kong, classifying her as the city's second local case.

The Centre for Health Protection (CHP) said after completing genome analysis of the 55-year-old woman, the result showed that the genetic sequence of her viral sample matched with that of Hong Kong's first local infection, an 82-year-old resident of Fung Tak Estate in Diamond Hill.

Both patients shared the same source of infection and the janitor likely acquired the infection in the vicinity of Fung Tak Estate where the school is located, the CHP said.

In addition to these two local cases, Hong Kong has reported 50 imported infections of the mosquito-borne disease this year.