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очаг инфекции stresses
gen.	center of infection; nidus of the infection (merriam-webster.com Oksanut)
biotechn.	infection court
Makarov.	centre of infection; focal point of infection
med.	pocket of infection; nidus; nidus of infection; site of infection (kat_j)
tech.	infection focal point
vet.med.	nucleus of infection; focus of infection
virol.	transmissible case cluster

очаг инфекции: 7 phrases in 4 subjects

Ecology	1
Immunology	1
Medical	4
Military	1