Multidrug Resistant Nosocomial Infections Phage Therapy

1. Public health experts have defined certain environments and specific pathogens for which alternatives to antibiotics will be particularly crucial.

0. What is a nosocomial infection? What is one reason why nosocomial infections are particularly difficult to treat? (4 pts)

A nosocomial infection is an infection acquired by a patient during a hospital stay or while receiving care in another healthcare facility (Blot et al., 2022). These infections are particularly difficult to treat because hospitalized patients are often immunocompromised, and the pathogens involved are frequently multidrug resistant.

0. What are ESKAPE pathogens, generally speaking? Which six bacterial species make up the ESKAPE pathogens? (4 pts)

ESKAPE pathogens are a group of bacteria that are known for “escaping” the effects of conventional antibiotics. They are responsible for many hospital-acquired infections and significantly contribute to antibiotic resistance.

1. Answer the following questions to learn more about phage therapy.

The primary goal of phage therapy is to use bacteriophage viruses that infect bacteria to specifically target and lyse (destroy) pathogenic bacteria, especially those that are resistant to conventional antibiotics (Lin et al., 2017).

1. What are lytic phages? Why are lytic phages (as opposed to other types of phages) required for phage therapy? (6 pts)

Lytic phages are bacteriophages that infect bacterial cells, rapidly replicate within them, and then cause cell lysis to release new phage particles.

Lytic phages are essential for phage therapy because they directly kill bacteria. In contrast, lysogenic (temperate) phages integrate into the bacterial genome and do not immediately destroy the host cell.

1. Phage therapy is currently an extremely rare treatment, attempted only after all conventional treatments have failed. What are two major challenges that have so far prevented phage therapy from becoming a mainstream medical treatment? (6 pts)

Regulatory/Standardization Issues: Phage preparations are often highly specific and need to be tailored to individual infections, which complicates standardization, large-scale clinical trials, and regulatory approval.

Narrow Host Range: Many phages target only specific bacterial strains; a single phage may not be effective against all strains within a species, necessitating the use of complex “phage cocktails.”

1. Phage therapy recipients are administered a “phage cocktail” consisting of multiple types of bacteriophages that all target one bacterial species. What is one reason we use a “cocktail” of phages, rather than a single type of bacteriophage? (4 pts)

A phage cocktail is used to broaden the range of targeted bacteria. By combining multiple phages, the treatment can cover a broader spectrum of bacterial strains and reduce the chance of bacteria developing resistance against a single phage type (Akram et al., 2023).

1. Phage therapy is not likely to be a replacement for antibiotics, but there are indications that the two therapies can be used synergistically to combat MDR infections. What does the term synergism mean in relation to drugs and therapeutics? (4 pts)

Synergism refers to the phenomenon where the combined effect of two treatments is greater than the sum of their individual effects. For example, when phage therapy and antibiotics are used together, they may work more effectively to eliminate multidrug-resistant bacteria than either treatment alone.

Source #1: Akram, F., Imtiaz, M., & ul Haq, I. (2023). Emergent crisis of antibiotic resistance: A silent pandemic threat to 21st century. Microbial pathogenesis, 174, 105923. https://doi.org/10.1016/j.micpath.2022.105923

This peer-reviewed article provides insights into antibiotic resistance a critical context for understanding the need for alternative therapies like phage therapy. Its widespread citation supports its credibility.