Initially, Elise was concerned that the causative agent could have been Staphylococcus

Gram staining method. MacConkay agar.

Explanation: Gram staining is a differential media. It is used to differentiate between gram positive and gram negative organisms.

Pseudomonas aeruginosa can be isolated from samples via an enrichment procedure. It is confirmed through use of selective and differential media

Staphylococci are catalase positive organisms. Catalase-positive cultures bubble immediately.

Gram staining method

Explanation:

One great differential method known is Gram staining. It uses certain dyes for the making of bacterial cells to standout over its background. The gram staining method is used in the differentiation of gram positive and gram negative organisms.

The correct answer is - a HMO.

Explanation:

A HMO health insurance plan or Health Maintenance Organization is the health insurance plan that provides coverage or medical care through the doctors, hospitals, or clinics under a contract or a from a particular network.

The Policy tends to be higher in this type of plan as it restricts patients to get their health care from a specific network. In a PPO plan patients can choose their healthcare provider and pay accordingly less in in-network and more in out of the network.