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Hepatitis C virus (HCV) belongs to the genus Hepatitis virus of the flaviviridae family and is a viral infection that affects the liver. It causes both acute (short term) and chronic (long term) illnesses that can be life-threatening.

Both mycoplasma and chlamydia belong to the broad category of bacteria, between bacteria and viruses in size, and contain both DNA and RNA. They are different from viruses because viruses have either DNA or RNA, not both. Therefore, it is classified as bacteria.

According to the World Drug Report 2024 released by the United Nations Office on Drugs and Crime in June this year, the number of drug users worldwide has increased to 292 million in 2022, an increase of 20 percent in 10 years.

Influenza is mainly transmitted through droplets of respiratory secretions, but also through direct or indirect contact with mucous membranes such as the mouth, nose, and eyes.

Respiratory syncytial virus (RSV) is a non-segmented single negative stranded RNA virus isolated from chimpanzee respiratory tract in 1956.

Data from the WHO's sentinel surveillance system spread across 84 countries show that the percentage of people testing positive for the virus has been rising over the past few weeks. Overall, more than 10 percent tested positive. The ratio fluctuates by region. In Europe, the positive rate is more than 20%. The Americas, Europe and the Western Pacific are all seeing new waves of infections.