Thailand on Wednesday reported 73 cases of the Deltacron variant, a hybrid of the Delta and Omicron strains of the new coronavirus, and all patients had fully recovered.

According to the Department of Medical Sciences (DMS) director-general Supakit Sirilak, the World Health Organization (WHO) was monitoring the Deltacron strain and there was no evidence to suggest it was more contagious or could cause more severe disease.

"There's no need to panic. If cases of the Delta variant drop further, the chances of the two strains combining also falls. However, if Deltacron is highly transmissible, it may replace Omicron," he said.

He said almost 2,000 samples from March 12-18 showed that almost 100% of cases were infected with the Omicron variant, with one case found to be Delta.

Of those samples, 406 were infected with the original BA.1 strain of Omicron while 1,479 were BA.2 (Deltacron).

He said the number of BA.2 cases was expected to increase but there was no information to suggest the strain would cause more severe symptoms.

He said 22 patients were also found to have contracted the BA.2.2 subvariant of Omicron and 61 others were found to be infected with the BA.2.3 strain.

Dr Supakit emphasised the need for people to get a booster shot.