The guards rode buses 25B, 26A, 33, 37, 101X and MT1 between 19 and 24 September. Health officials appeal to passengers to come forward.
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Dedicated team has already come to the aid of 2,500 people with mobility impairments.
Reserves forecast to last for 20 years, and mine is expected to create 450 local jobs.
Patient is a 37-year-old Hong Kong woman, who travelled extensively in Europe and the Middle East over the summer.
Health chief Alvis Lo Iek Long blasts lax procedures at quarantine hotels and warns Macao residents to strictly observe prevention measures.
Police warn public to verify any suspicious calls and never to reveal personal information or transfer money to strangers.
More than 313,000 tested so far proved negative; race is on to complete city’s second mass testing drive by 3 pm tomorrow.
Many of the city institutions are temporarily shut down and activities cancelled or postponed.
Parade of military hardware also includes stealth fighters, bombers and early warning and electronic warfare planes.