Only patients with borderline or positive results in the corresponding
tests were used for calculation. In NT, one patient (3.2%) lost
antibodies, two (6.5%) developed higher, more stable IgG titers, the
antibody titers of 28 patients (90.3%) stayed constant during the first
five months post infection.
Figure 1: The median titer of s ymptomatic patients was
two levels higher than those of asymptomatic patients.
Figure 2: Development of neutralizing antibodies goes along
with disease severity. Neutralization activity is more pronounced in
patients with more severe infections. Moderate and severe courses of
disease led to neutralizing antibodies in 100% of the patients, whereas
33% and 20% of persons with an asymptomatic course of infection did
not constantly develop neutralizing antibodies.