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Neighbour-joining tree of partial herpes simplex virus type 1 glycoprotein G sequences. Numbers indicate percentage bootstrap values (only shown if >80). Scale bar indicates 1% genetic divergence. C, cluster patients' viral sequences; I, surgical intensive care unit patients' viral sequences; M, viral sequences from patients from other wards; B, viral sequence recovered from brochoscope; R, reference strains (R1 = 17+, R2 = F, R3 = Kos).
