- A needlestick injury (i.e. the patient's infected blood is on a needle, which you then prick yourself with, accidentally [e.g. a doctor] or non-accidentally [e.g. drug users sharing needles]) carries roughly a 30% transmission risk. Compare this with a roughly 0.3% risk of HIV transmission in the same circumstances.
- A mother who has actively replicating HBV can have up to a 90% risk of transmission to her child.
- HBV retains infectivity when stored at 30°C to 32°C for at least 6 months and when frozen at –15°C for 15 years.
- HBV present in blood can withstand drying on a surface for at least a week.
So, basically - it's very infectious.