Sarkar J K, Mitra A C, Mukherjee M K
Bull World Health Organ. 1975;52(3):307-11.
Blood samples from 57 contacts of 6 smallpox cases were tested for haemagglutination-inhibiting (HI) and neutralizing antibodies. All 6 contacts who subsequently developed smallpox were unvaccinated and had neutralizing antibody titres of 10 or less. However, 6 unvaccinated contacts with similar antibody levels did not develop smallpox. None of the 41 vaccinated contacts, regardless of their antibody level, contracted the disease.
对6例天花病例的57名接触者的血样进行了血凝抑制（HI）和中和抗体检测。随后感染天花的所有6名接触者均未接种疫苗，且中和抗体滴度为10或更低。然而，6名抗体水平相似的未接种疫苗的接触者并未感染天花。41名接种疫苗的接触者，无论其抗体水平如何，均未感染该病。
