No saliva on the ball
The fans have often seen bowlers and fielders using their saliva to shine the cricket ball. It is done to get the ball to swing in the air, by keeping one side shiny, while the other gets roughed up. Apart from saliva, cricketers often use their sweat as well. However, this might all come to an end after the Coronavirus pandemic.
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The virus stays alive in the saliva and is spread by people coughing and sneezing. If the droplets in the air enter other people via mouth or nose, one is affected by the virus. Therefore, using the saliva on the ball to shine it becomes a big no-no and the ICC and players themselves will forego this practice for the foreseeable future to keep themselves and others safe.