Mohammad Isam is ESPNcricinfo's Bangladesh correspondent. @isam84
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Walsh, who is asymptomatic, had tested negative upon arrival in Dhaka on January 10. But tests on Wednesday and Thursday came out positive, and he is now in self-isolation until he gets two negative results. According to a CWI statement, he had no contact with the other squad members.
"In accordance with the established medical protocols, Walsh remained isolated from the West Indies squad and is now under the care and supervision of the Team Physician, Dr Praimanand Singh," the CWI statement read. "All other members of the West Indies touring squad returned second negative COVID-19 tests, after undergoing four tests within the last 11 days."
Both the West Indies Test and ODI squads began training on Thursday after three days of room isolation at the team hotel in Dhaka. Bangladesh's 24-member preliminary ODI squad is also staying at the same hotel.
The two West Indies squads will continue training in separate groups from Friday, before the ODI squad travels to BKSP on January 18 to play their only warm-up game. The first two ODIs of the series are in Dhaka on January 20 and 22, while the third ODI is in Chattogram on January 25.