Not all countries allow shipments of infectious substances by mail.
Contact local postal authorities to determine if the countries you are shipping from, through, and to, allow infectious substances to be shipped by mail.
Shippers must follow the appropriate local requirements when shipping infectious substances.
State variations often indicate whether a country accepts infectious substances shipped through the mail. ICAO recently published a website listing all of the State variations published in the Technical Instructions. http://www.icao.int/safety/DangerousGoods/Pages/StateVariationPage.aspx. The website will be updated frequently with any changes.