Fig. 4From: Epidemiology of Astrovirus, Norovirus and Sapovirus in Greek pig farms indicates high prevalence of Mamastrovirus suggesting the potential need for systematic surveillanceMedian-joining haplotype network of the Astrovirus sequences. Circle sizes are proportional to the frequency of each haplotype, whereas the unlabeled dots indicate interval missing haplotypes, potentially not sampled, known as median vectorsBack to article page