Background. The prozone phenomenon is known to be associated with high antibody titers; other associations, such as host factors, have not been elucidated.
Background. Algorithms for the diagnosis of syphilis continue to be a source of great controversy, and numerous test interpretations have perplexed many clinicians.
Background. In early September 2009, an outbreak of influenza occurred at a college campus in Beijing, China, in which both pandemic H1N1 and seasonal H3N2 viruses were detected.
Background. We followed a cohort of 773 individuals who received a monovalent vaccine against 2009 pandemic influenza A (H1N1). Approximately 6 weeks after vaccination, 12 persons developed the disease.
Background. Avian influenza A virus H5N1 has the potential to cause a pandemic. Adjuvants and whole-virion vaccines are regarded as antigen sparing for pandemic vaccines.