The Hong Kong Centre for Health Protection said on Thursday that it is investigating two imported cases of dengue fever, and encouraged people to protect themselves against the illness.
The first patient is a 33-year-old woman Her symptoms of fever, headache, muscle pain, joint pain, rash and vomiting began on March 29. She was admitted to the hospital on April 1 and is in stable condition.
The second patient is the woman's husband, 32, whose symptoms also began on March 29. He was admitted to the hospital on April 2 and is in stable condition.
CHP said the patients' blood samples tested positive for dengue NS1 antigen.
CHP's investigation revealed the pair had traveled to Bali, Indonesia between March 20-30. They traveled with four companions, two of whom also developed similar symptoms and received medical attention.
Dengue fever is contracted through a bite by an infected mosquito. CHP said the best ways to prevent contracting the illness include wearing long-sleeves and pants, using insect repellent and using mosquito screens or nets in hotel rooms.
CHP said 10 cases of dengue fever have been reported in 2014, all of which were imported. It said 103 imported cases were reported in 2013, with no local cases.