Are insect spirits nigh-unkillable as they are in Shadowrun Returns?

This might be a dumb question. But in the video game Shadowrun Returns, Insect Spirits are impossible to kill without the astral bioweapon Project Aegis. Without it, killing their bodies just causes their ethereal form to manifest for a few seconds before rapidly retaking physical form. Does this hold true in the tabletop writ large? It's not mentioned in their wiki writeup or in Burgerkrieg's fairly extensive video about Invae.