Jamwal is the sixth MLA, including two ministers in the 68-member Himachal Pradesh Assembly, who tested positive for COVID.
The Congress walked out from the Himachal Pradesh Assembly on the ninth day of the monsoon session on Thursday.
Chief Minister Jai Ram Thakur termed the walkout unnecessary and said it was done to get media coverage.
Jal Shakti Minister Mahender Singh Thakur is unlikely to participate in the Assembly session as he tested positive for the coronavirus on September 3.
The assembly will reassemble at 11 am instead of its scheduled timing at 2 pm, Chief Minister Jai Ram Thakur said on Sunday.
Rajinder Rana defeated two-time Chief Minister Dhumal in a straight contest by 2,933 votes in the Himachal Pradesh's Sujanpur, the seat he was asked to contest from.
The BJP chief said the people have been forced to live under the shadow of terror due to various mafias "flourishing" under the patronage of the Congress party.
Interestingly, political parties in this election are already wooing Tibetans with posters highlighting pictures of the Dalai Lama.
Finance minister Arun Jaitley termed the state Congress government a ‘zero-integrity government with no credibility’.