A new coronavirus sub variant arrived in Malaysia on Nov. 6.

Malaysian authorities confirmed two students, who returned from the United Kingdom, are infected with COVID-19 Delta AY.4.2.

The Health Ministry revealed the pair represent the South East Asian country’s first cases of their kind.

They were first intercepted at Kuala Lumpur International Airport back on Oct. 2. Their initial reverse transcription polymerase chain reaction (RT-PCR) tests produced negative results. However, the second RT-PCR test came back positive five days later during quarantine.

Health Director-General Tan Sri Dr. Noor Hisham Abdullah confirmed the samples went through complete genome sequencing at the Institute of Medical Molecular Biology, Universiti Kebangsaan Malaysia before the outcome was finally known on Oct. 30.

Abdullah said the AY.4 variant is one of 75 lineages descending from the Delta variant according to The Star.

Meanwhile, the AY.4.2 variant is recorded as one sub lineage of AY.4, also known as Delta Plus. The UK Health Safety Agency also investigated the AY.4.2 variant at the time of publication.

Delta Plus represents 10 percent of the Britain’s total complete genome sequencing activity. Y145H and A222V are two extra mutations to spike proteins from AY.4.2.

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