A quarantine transmitter was a device on some Starfleet starships which, when activated, would broadcast a general signal warning other vessels of hazards on board. This would be done upon suspicion of a dangerous disease or other hazard on board the vessel, and the transmitter could be activated remotely from another vessel. It would advise such vessels to not board the ship broadcasting the warning, at risk of picking up the hazard and passing it to other vessels. The USS Lantree was equipped with a quarantine transmitter, and it would broadcast the following message:
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