Leronlimab can't be blamed for this, it's an adverse effect of being on a ventilator.

4. Risks of Being on a Ventilator

Patients on ventilators run a higher risk of developing pneumonia because of bacteria that enters through the breathing tube. It can also make it difficult for them to cough and clear airways of irritants that can cause infections.

https://niach.ernesthealth.com/10-things-to-k...entilator/