China is witnessing a surge in human metapneumovirus (HMPV) cases, sparking concerns of another health crisis after COVID-19 pandemic. Reports and social media posts show overcrowded hospitals, with some users also suggesting the presence of multiple viruses such as HMPV, influenza A, Mycoplasma pneumoniae and even COVID-19. HMPV causes flu-like symptoms and can lead to severe respiratory issues, especially among children and vulnerable groups. Let's take a look at the respiratory virus in detail.