Varicella vaccine mild and have not been associated with serious complications. Approximately 5% of children who receive the vaccine develop a fever or rash. Adverse reaction reports for the period 1995 to 2005 found no deaths attributed to the vaccine despite approximately 55.7 million doses being delivered. Cases of vaccine-related chickenpox have been reported in patients with a weakened immune system, but no deaths. The literature contains several reports of adverse reactions following varicella vaccination, including vaccine-strain zoster in children and adults. The Varicella zoster vaccine is made from the Oka/Merck strain of live attenuated varicella virus. The virus was initially obtained
Lyme disease small rodents—the primary reservoirs for Lyme disease. As a consequence of increased human contact with host and vector, the likelihood of transmission of the disease has greatly increased. Researchers are investigating possible links between global warming and the spread of vector-borne diseases, including Lyme disease. The term "chronic Lyme disease" is controversial and not recognized in the medical literature, and most medical authorities advise against long-term antibiotic treatment for Lyme disease. Studies have shown that most people diagnosed with "chronic Lyme disease" either have no objective evidence of previous or current infection with "B. burgdorferi" or are people who should