Definition: In this task, you're given a paragraph from the research paper and your task is to generate a suitable title for the research paper based on the given paper. Under 100 words is a good title length.
Input: Respiratory fi lters (also known as bacterial or microbial fi lters) are devices with a high capacity to prevent the passage of microorganisms [ 1 ] and are placed in the breathing circuit in order to protect the patient from possible respiratory infections carried by the respirator. The use of respiratory fi lters was proposed after the reports between 1952 and 1972 of several outbreaks of respiratory infection attributed to contamination of anesthesia machines [2] [3] [4] . However, the results of later studies showed no contamination of patients by anesthesia machines, and vice versa [5] [6] [7] [8] [9] , and that they could have undesirable effects [ 10 ] and did not decrease the incidence of ventilator-associated pneumonia (VAP) in clinical studies [11] [12] [13] ; therefore, its usefulness is questioned. The internal component of the fi lters can be composed of different materials [ 1 ] : wool, foam, paper, polypropylene, polysulfone, ceramics or glass fi bers. Filters can have different mechanisms of microbial fi ltration [ 1 ] : (1) mechanical fi ltration, (2) electrostatic fi ltration and (3) fi ltration bactericides.

20 Respiratory Filters and Ventilator-Associated Pneumonia: Composition, Efficacy Tests and Advantages and Disadvantages