Infection with EBV is widespread and the prevalence of the virus in Western populations is more than 90%. The virus primarily spreads via the oral route (saliva) and at a time, approximately half of the asymptomatic virus carriers shed EBV. In nonindustrialized nations, primary infection takes place between 2 and 5 years of age and is mostly asymptomatic. However, infection later in life increases the risk to develop infectious mononucleosis (IM), which is a transient and self-limiting lymphoproli-ferative disease characterized by lymphadenopathy, highgrade fever, hepatosplenomegaly, and pharyngitis or tonsillitis. Atypical mononuclear cells and an inverted ratio of CD4+ vs. CD8+ cells are hematological markers of IM. Generally, IM lasts for 4 to 6 weeks, eventually establishing an asymptomatic persistent infection.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.