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HPA labeling of S. pneumoniae in non-human blood and serum. The type 2 encapsulated S. pneumoniae strain D39 was diluted to 2.5 × 106 cfu/ml into sheep blood or fetal bovine serum (63× objective). Cultures were incubated with HPA (25 μg/ml). Arrows point to pneumococcal cells. Bar = 25 μm.
