Metrolink services have been disrupted this morning due to the number of tram drivers off work due to coronavirus.
A number of staff are currently off sick or isolating due to Covid.
The East Didsbury line, Manchester Airport, Rochdale via Oldham and Trafford Park have all been affected, say TfGM.
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Minor delays are being reported on these lines.
Services are being affected in both directions.
In a post on Twitter, Metrolink said: "Due to staff shortages as a result of COVID we are currently experiencing minor delays on the East Didsbury, Manchester Airport, Rochdale via Oldham and Trafford Park lines."
Metrolink has been plagued by staff sickness since the start of the pandemic, with hundreds of tram drivers being forced to isolate or becoming sick with Covid.
The latest spate of staff illness comes as coronavirus infection rates in some part of the region continue to rise.
Infection rates have gone up in six boroughs of Greater Manchester in the last seven-day period.
Trafford continues to have the highest coronavirus proportion of cases.
The borough recorded a rate of 597.3 cases per 100,000 people in the week ending October 21.
In Greater Manchester as a whole, the infection rate is now 407.5 cases per 100,000 population.
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