at one of the markets in cherno, medic loot and medical infected spawn.

it's this line in zombie_territories.xml:

<zone name="InfectedMedic" smin="0" smax="0" dmin="3" dmax="5" x="6342.08" z="2521.46" r="50"/>

also theres this two lines:

<zone name="InfectedVillage" smin="0" smax="0" dmin="2" dmax="6" x="11055" z="15744" r="100"/>
<zone name="InfectedVillage" smin="0" smax="0" dmin="2" dmax="6" x="11250" z="15927" r="90"/>

its coordinates are outside the map.