Later analysis suggested that vaccines produced by the former Soviet bloc countries until 1980, and used in the USSR, China, Japan, and several African countries, may have been contaminated, meaning hundreds of millions more may have been exposed to SV40.In 1998, the National Cancer Institute undertook a large study, using cancer case information from the institutes SEER database. The published findings from the study revealed no increased incidence of cancer in persons who may have received vaccine containing SV40. Another large study in Sweden examined cancer rates of 700,000 individuals who had received potentially contaminated polio vaccine as late as 1957; the study again revealed no increased cancer incidence between persons who received polio vaccines containing SV40 and those who did not. The question of whether SV40 causes cancer in humans remains controversial, however, and the development of improved assays for detection of SV40 in human tissues will be needed to resolve the controversy. During the race to develop an oral polio vaccine, several large-scale human trials were undertaken. By 1958, the National Institutes of Health had determined that OPV produced using the Sabin strains were the safest. Between 1957 and 1960, however, Hilary Koprowski continued to administer his vaccine around the world. In Africa, the vaccines were administered to roughly one million people in the Belgian territories (now the Democratic Republic of the Congo, Rwanda, and Burundi).
Steroid injection is not effective in people with Type 1 diabetes. If triggering persists 2 months after injection, a second injection can be considered. Most specialists recommend no more than 3 injections because corticosteroids can weaken the tendon and there is a possibility of tendon rupture. Triggering is predictably resolved by a relatively simple surgical procedure under local anesthesia. The surgeon will cut the sheath that is restricting the tendon. The patient should be awake in order to confirm adequate release. On occasion, triggering does not resolve until a slip of the FDS (Flexor digitorum superficialis) tendon is resected. One study suggests that the most cost-effective treatment is up to two corticosteroid injections followed by open release of the first annular pulley. Choosing surgery immediately is an option and can be affordable if done in the office under local anesthesia. Surgery
Trigger digits can be released percutaneously using a needle. This is not used for the thumb where the digital reves are at greater risk. References
External links

Video of Trigger Finger Release Surgery on YouTube
American Academy of Orthopaedic Surgeons information on trigger finger
Information from the Mayo Clinic