Personalized Bacteriophage Cocktails for Resistant Bacterial Strains

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Solution Overview

Problem

Current phage therapy is limited by the specificity of bacteriophages to particular bacterial hosts, leading to rapid ineffectiveness against emerging phage-resistant strains, and there is a need for methods to create personalized phage cocktails that can target both the dominant and resistant bacterial strains.

Innovation Solution

A method involving constructing bacterial diversity sets, collecting diverse phages, and creating Tier 1 and Tier 2 phage libraries to identify and purify lytic phages, screening for therapeutic efficacy, and compounding phage cocktails that include phages with undetectable activity against the target but crucial for overall efficacy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single phage is used to target a specific bacterial host, then the phage can effectively kill the target bacterial strain, but the therapy quickly becomes ineffective as phage-resistant bacterial strains emerge

Engineering Contradiction:

Improvetherapeutic efficacyVSAvoidduration of therapeutic effect

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The invention divides the therapeutic approach into multiple segments by using cocktails containing multiple different phages rather than a single phage. Each phage in the cocktail targets different bacterial strains or mechanisms, so when one phage encounters resistance, other phages can still effectively kill the bacterial population, thereby extending the duration of therapeutic effect and maintaining reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The phage cocktail serves multiple functions simultaneously: it targets the dominant bacterial strain while also covering emergent resistant strains. The cocktail is designed to be universally effective across multiple bacterial variants, making the therapy both reliable and long-lasting by addressing multiple potential resistance mechanisms in one treatment

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If phage therapy is customized to target a specific bacterial strain, then the therapy is highly effective against that strain, but it cannot address emergent resistant strains

Engineering Contradiction:

Improvetargeting precisionVSAvoidcoverage of bacterial strains

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The bacterial target population is segmented into multiple strain types (dominant strain and potential resistant strains), and the phage cocktail is correspondingly segmented into multiple phages, each optimized to target specific segments. This segmentation allows the therapy to maintain high precision against the dominant strain while simultaneously having adaptability to cover resistant variants

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention merges multiple phages with different specificities into a single cocktail formulation. This combination preserves the targeting precision of individual phages against their specific hosts while adding versatility through the collective coverage of multiple bacterial strains, including both dominant and emergent resistant strains

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If a broad spectrum phage product is developed to target numerous bacterial strains, then the phage can cover multiple strains, but it is difficult to develop and maintain efficacy

Engineering Contradiction:

Improvehost range coverageVSAvoidcomplexity of phage product development

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Rather than creating a single complex broad-spectrum phage, the invention segments the solution into multiple narrower-spectrum phages, each optimized for specific bacterial strains. This segmentation simplifies the development process for each individual phage while achieving broad coverage through their combination in a cocktail, reducing the overall complexity of product development

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method enables the creation of personalized phage cocktails that effectively target both the dominant and emerging resistant bacterial strains, providing synergistic bactericidal effects and preventing phage resistance, thus ensuring long-term therapeutic efficacy.

Implementation Method 1

Bacteriophages ('phages') are diverse viruses that replicate within and can kill specific bacterial hosts

Methodology Applied

Scientific EffectLytic infection:

Data Source

PatentUS12448705B2Bacteriophage compositions and methods of selection of components against specific bacteria

Publication Date: 2025.10.21 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

AI summary

The subject matter of the instant invention relates to methods of compounding compositions comprising bacteriophage effective for treating bacterial infections, including but not limited to, multidrug resistant bacterial infections. The invention also relates to compositions, bacterial diversity sets, and phage libraries prepared according to the methods of the instant invention.