As Terran
Make:
Hellion
Banshee
LiberatorPunish the immobile host body between waves; do not fight only locusts.
Open in the counter tool with Swarm Host tagged ->As Protoss
Make:
Oracle
PhoenixChargelotTrack the host location and counterattack while locusts are on cooldown.
Open in the counter tool with Swarm Host tagged ->As Zerg
Make:
Mutalisk
RoachNydus WormMobility beats Swarm Hosts. Force them to defend more than one place.
Open in the counter tool with Swarm Host tagged ->
Zergling
Baneling
Ravager
Queen
Hydralisk
Lurker
Corruptor
Overlord