yes you are right 0 one bug in each. They do very little damage as they don't come in millions though each one is a sap sucker so slightly deforms the stem or leaf it lives on. The quickest cure is to hit with a water jet from your hose - which knocks them off & is more acceptable for squeamish people than wiping off with your finger ( which also works).

Spraying does not work as they have the froth to protect them from direct contact chemicals, though systemic insecticides ( i.e. the stronger ones) can help, it is a bit extreme to poison an entire plant for just a few bugs.