What is the second link in the chain of transmission

The chain of infection, if we think of it as an actualchain, is made up of six different links: pathogen (infectious agent), reservoir, portal of exit, means oftransmission, portal of entry, and the new host. Eachlink has a unique role in the chain, and each can be interrupted, or broken, through various means.

Ibelieve this would be an obstacle.

20 times a minute is usually the average respritory rate of an adult. additionally the patient is breathing on his own, is clearly maintaining his airway, and is intaking a sufficient amount of air. you shouldn't use a bag valve mask, cpap, or other form of positive pressure ventilation, unless the patient has lost control of his airway, and is not breathing (apneic) or has rapid breathing or slow and shallow respirations. this patient would most likely and should be put on an non-rebreather mask or nrb attached to 100% high flow oxygen at 15 l/min. don't use a nasal cannula, as the amount of oxygen it provides is limited with a rate of 6 l/min.