Health authorities are warning Barbadians to be extra cautious during the busy Christmas season amid a double whammy of a lingering COVID-19 pandemic that has resulted in another death in recent days, and a highly infectious flu virus.Chief Medical Officer (CMO) Dr Kenneth George said in a recorded statement on Monday that both viruses were presenting some challenges, as he noted that the true extent of COVID-19 cases may not be known since testing has declined.He disclosed that just below 20 per cent of COVID-19 tests performed were positive while the RE – the number of people in a population who can be infected by a COVID-19-positive individual at any specific time – was above one.“And those two metrics together indicate that we are still having COVID spread in our communities. In addition, what we also note is that the number of persons coming to be tested has fallen off and, therefore, the number of persons having COVID in our communities may not be a true reflection of what it really is,” Dr George cautioned, as he urged the most vulnerable groups to “go the extra mile” to protect their health.