Answer :
The decrease in resistant strains of bacterial pneumonia in Icelandic children most likely occurred when the use of antibiotics was reduced. Overuse of antibiotics can lead to the growth of resistant strains, but reducing use can decrease their prevalence.
The subject of this question pertains to how certain factors affect the prevalence of resistant strains of bacterial pneumonia among Icelandic children. The decline in resistant strains of bacterial pneumonia likely occurred when the use of antibiotics was reduced. This is largely due to the nature of bacterial evolution and antibiotic resistance. When bacteria are overly exposed to antibiotics, those that are resistant to the medication survive and multiply, leading to an increased prevalence of antibiotic-resistant strains. Reducing antibiotic use gives non-resistant strains a chance to proliferate, thereby reducing the overall percentage of resistant forms within the population.
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