Streptococcus suis infection is a zoonotic disease caused by the bacterium Streptococcus suis (S. suis). It is a notifiable infectious disease in Hong Kong.
The disease most commonly causes meningitis and presents with fever, headache and vomiting. It may also present with skin bleeding and less commonly, sepsis, endocarditis, arthritis, bronchopneumonia and toxic shock syndrome. The characteristic complication of S. suis infection is deafness which is likely to remain permanent.
Mode of transmission
S. suis infection is a common disease among pigs. The bacterium is carried in the upper respiratory tract of pigs, and spread among pigs by nose-to-nose contact or by aerosol over short distances. Apart from pigs (including wild boars), it can occasionally be found in other animals such as horses, dogs, cats and birds.
Human infection by S. suis occurs mainly in adults. It is transmitted through direct contact and often related to exposure through wounds on the skin while handling infected pigs or other animals, raw pork and other pig products. But it may also be transmitted via ingestion or through mucous membranes.
High risk groups
People at risk include pig breeders, abattoir workers, meat processing and transport workers, butchers and cooks. Persons who are immunocompromised including those with spleen removed, persons with diabetes mellitus, cancer and alcoholism, are also at greater risk of infection.
Ranges from a few hours to two weeks.
S. suis infection can be treated with antibiotics.
There is no human vaccine available for S. suis. The public should adopt the following measures to reduce the risk of infection:
1. Maintain good personal hygiene
2. Maintain good food hygiene
* Please visit the website of Centre for Food Safety for more information on food safety.
People with suspected symptoms should consult their doctor as soon as possible and report their relevant exposure history.