An alarming spike in COVID-19 and flu cases in Australia could put the U.S. on track for what health experts call a “twindemic” – a dangerous viral one-two punch in the months ahead. It’s now winter in Australia, which is often a harbinger for the U.S. flu season. That country is having a massive wave of flu cases that have eclipsed pre-pandemic rates. At the same time, Aussie health officials report that COVID-19 cases are skyrocketing as Omicron variants (including the highly transmissible BA.5 strain) continue to spread across the country.