Six people stuck in a Perth quarantine centre after a deadly hantavirus outbreak on their cruise ship have discovered they're not infected.The four Australian citizens, one permanent resident and a New Zealand national quarantining for three weeks in Western Australia's Bullsbrook Centre for National Resilience received their blood test results today.The federal Health Department confirmed they were well and would only be retested if they developed symptoms.READ MORE: Wife's heartbreaking tribute after Aussie dad killed in shark attackThe group of