RESUMEN
In the course of 6 years, 23 otherwise healthy patients with acute febrile illness and leukopenia were diagnosed as having acute parvovirus B19 infection. Five of these patients had agranulocytosis associated with acute parvovirus B19 infection and one had chronic agranulocytosis due to persistent parvovirus B19 infection. The diagnosis was made after positive anti-parvovirus B19 IgM antibodies were found in all of the patients and viral DNA was detected by PCR in four patients. Neutropenia and agranulocytosis appear to be much more frequently associated with parvovirus B19 infection than previously reported.
RESUMEN
The authors used a longitudinal design to investigate 2 major issues: first, whether popularity with classmates results in better academic achievement or academic achievement improves popularity with classmates; and second, how time affects in-group and out-group contacts in the elementary school. The authors studied these issues by means of an interactive measure of reciprocated and unreciprocated contacts with peers. This measure indicated the extent to which aspirations for close relations were fulfilled or not fulfilled by each member of a dyad. Participants were 305 fifth- and sixth-grade Israeli students and 100 immigrant classmates. Results indicated (a) higher academic achievement predicted higher numbers of bids for reciprocal contacts in class but not higher numbers of bids for contacts that were not reciprocated; (b) a higher level of unreciprocated bids for contact seemed to have a detrimental effect on academic performance; (c) teachers tended to rate as more adjusted to school the immigrant students who were willing to engage in more intensive reciprocated contacts with Israeli peers; and (d) reciprocated contacts tended to increase whereas unreciprocated contacts were inclined to decrease as a function of time. These changes over time were more prominent for the dominant hosts than for their migrant classmates.
