Once Bitten, Twice... Bitten

Hold onto a Tarr for 15 seconds. The Tarr are the corrupting black slimes that form when a largo eats a wrong plort - they damage you and spread. Vac one up into your tank and simply keep it held for 15 seconds before disposing of it (fire it into the Slime Sea or an incinerator). Grab a fresh Tarr and hold tight - just don't let it touch you.