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Daily News Analysis

Explained: What is the tick-borne virus spreading in China?  

7th August, 2020 Health

Context: China is now facing a new health threat. A disease called Severe Fever with Thrombocytopenia Syndrome (SFTS), caused by a tick-borne virus, has killed seven and infected at least 60, setting off alarm bells among health officials in the country.


  • A large number of the cases reported were concentrated in East China’s Jiangsu and Anhui provinces, local media reported.
  • While the disease is transferred to humans through tick bites, Chinese virologists have warned that human-to-human transmission of the virus cannot be ruled out.
  • Unlike SARS-CoV-2 however, this is not the first time the SFTS virus has infected people. The recent spate of cases merely marks a re-emergence of the disease.


What is the SFTS virus?


  • Severe fever with thrombocytopenia syndrome virus (SFTSV) belongs to the Bunya virus family and is transmitted to humans through tick bites.
  • The virus was first identified by a team of researchers in China over a decade ago. The first few cases were reported in rural areas of Hubei and Henan provinces in 2009.
  • The team of researchers identified the virus by examining blood samples obtained from a cluster of people exhibiting similar symptoms.
  • Due to the rate at which it spreads and its high fatality rate, SFTS has been listed among the top 10 priority diseases blueprint by the World Health Organisation (WHO).
  • Virologists believe an Asian tick called Haemaphysalis longicornis is the primary vector, or carrier, of the virus.
  • The disease is known to spread between March and November. Researchers have found that the total number of infections generally peaks between April and July.
  • Farmers, hunters and pet owners are particularly vulnerable to the disease as they regularly come in contact with animals that may carry the Haemaphysalis longicornis tick.


What are the symptoms of the SFTFS virus?


  • According to a study conducted by a team of Chinese researchers in 2011, the incubation period is anywhere between seven and 13 days after the onset of the illness.
  • Patients suffering from the disease usually experience a whole range of symptoms, including, fever, fatigue, chill, headache, lymphadenopathy, anorexia, nausea, myalgia, diarrhea, vomiting, abdominal pain, gingival hemorrhage, conjunctival congestion, and so on.


How is SFTS treated?


  • While a vaccine to treat the disease is yet to be successfully developed, the antiviral drug Ribavirin is known to be effective in treating the illness.