The Health Ministry of Malaysia said that four crew members on a ship tested positive for Covid-19 on 31 August.
The ship had arrived from Singapore and called at the Port Dickson, Negeri Sembilan, according to a post by health director-general Noor Hisham Abdullah.
All four infected individuals were asymptomatic.
A statement from the Health Ministry said: “A total of 34 crew members onboard were screened on 28 August for ship signing-on and signing-off purposes and of that number, four cases were detected positive and six negative, and another 24 were awaiting results.”
The crew members were shifted to the Sungai Buloh Hospital to ensure that there were no local transmission risks.
Additionally, disinfection and decontamination measures, among other prevention methods, are being carried out on the ship.
On 30 August, Malaysia reported that two people tested positive for Covid-19 from eight people associated with another ship.
The ship was docked at Port Klang in Selangor.
So far, Malaysia has reported over 9,300 confirmed cases of Covid-19 with a death toll of 127.
Last week, the International Chamber of Shipping (ICS) partnered with the International Maritime Health Association (IMHA) and the International Association of Independent Tanker Owners (INTERTANKO) to issue new protocols and reduce the risk of Covid-19 onboard.
Last month, the Kwai Tsing Container Terminals, the largest container port facility in Hong Kong, recorded 65 Covid-19 cases.
The Maritime and Port Authority of Singapore also reported that 15 crew members on an ocean-going ship tested positive for Covid-19.
Additionally, 41 people who were on the MS Roald Amundsen cruise ship operated by Norwegian expedition cruise line Hurtigruten tested positive for Covid-19.