All India United Democratic Front (AIUDF) MLA Nizamuddin Chowdhury and eight members of his family tested positive for COVID-19 on Saturday.
His driver and personal security officers were also found to be positive. The legislator is under home isolation.
Earlier, seven MLAs of BJP and one from Congress were diagnosed with the coronavirus infection, making Chowdhury the ninth legislator to be infected with the disease. Chowdhurty was elected in Assam Legislative Assembly election in 2016 from Algapur constituency.
Choudhury is also the fourth MLA from the Barak Valley to test positive along with BJP MLA Mihir Kanti Shome from Udharbond, Deputy Speaker Aminul Haq Laskar from Sonai, and Krishnendu Paul from Patharkandi.
