Bacterial Infections: Effective Treatment, Types of Antibiotics, and Probiotics

Introduction: Challenges in the Treatment of Bacterial Infections

Bacterial infections remain one of the leading causes of morbidity and mortality worldwide, especially among critically ill patients. They represent a serious healthcare challenge [4]. The complexity of treatment is driven not only by the diversity of pathogens, but also by the rapid spread of multidrug-resistant strains, which significantly complicates the selection of effective therapy [4, 8]. Timely and appropriate administration of antibiotics is critical for reducing mortality and improving clinical outcomes [4].

Empiric Antibiotic Therapy: When Time is Critical

In the early stages of a disease, particularly when sepsis is suspected, the source of infection and the specific pathogen often remain unknown [1]. In such cases, physicians resort to empiric antibiotic therapy—the administration of broad-spectrum antibiotics before obtaining the results of bacteriological cultures and determining microbial susceptibility [1].

A key aspect of empiric therapy is selecting drugs capable of covering the most likely pathogens, based on local data regarding bacterial susceptibility within a specific medical institution [1]. Sometimes, concerns about allergic reactions (e.g., to penicillin) may unjustifiably narrow the spectrum of antibiotic choices, although cephalosporins and carbapenems can frequently be safely administered to such patients [1]. To ensure the proper use of antibacterial agents and minimize the development of resistance, it is crucial to understand the basic pharmacokinetic properties of the prescribed drugs [1]. It is worth noting that negative culture results do not always rule out an active infection, and positive cultures may not always reflect the true disease-causing pathogen [1].

Combating Resistance: Complex Cases and New Approaches

Antibiotic resistance is recognized as one of the primary global threats to humanity [8]. Its development is largely driven by the excessive and irrational use of antibiotics [8]. In recent years, few new antibacterial molecules have entered the market, and those available are typically reserved for treating severe infections caused by bacteria resistant to other drugs, and should only be prescribed by infectious disease specialists [8].

One of the most complex examples is Staphylococcus aureus bacteremia (SAB), especially its methicillin-resistant strains (MRSA). Mortality from SAB remains unacceptably high, and its treatment poses a serious clinical challenge [3]. Up to 50% of patients with MRSA bacteremia (MRSAB) fail to respond to initial vancomycin therapy, requiring so-called "salvage" therapy [2]. Resistant MRSAB is difficult to fully eradicate, particularly when the source of infection cannot be controlled [2].

Although vancomycin and daptomycin are the only antibiotics approved by the US FDA as monotherapy for MRSAB, effective treatment of resistant forms often requires new strategies involving combination therapy [2]. These strategies include:

• Vancomycin in combination with beta-lactams [2].
• Therapy based on daptomycin, ceftaroline, or linezolid [2].
• The use of quinupristin/dalfopristin, telavancin, trimethoprim/sulfamethoxazole, or fosfomycin [2].

Managing patients with SAB requires a comprehensive, multidisciplinary approach. Despite the emergence of new options for treating methicillin-resistant SAB, additional clinical trial data are needed [3].

The Role of Probiotics in Supportive Therapy

While saving lives, antibiotics can cause undesirable side effects, particularly affecting the gastrointestinal tract by disrupting the natural microflora [5, 6]. In this regard, probiotics, especially Lactobacillus strains, demonstrate significant potential as adjunctive therapy.

For instance, in the treatment of Helicobacter pylori infection in children, adding Lactobacillus spp. to standard eradication therapy not only increases its efficacy but also significantly reduces the incidence of side effects [6]. Similarly, in bismuth quadruple therapy for H. pylori eradication, multi-strain probiotics can significantly alleviate gastrointestinal symptoms such as reflux, dyspepsia, and diarrhea without affecting eradication success [5]. Probiotics are a safe and well-tolerated addition to primary therapy [5]. It is also noted that traditional Chinese medicine may help regulate the gut microbiota in H. pylori-associated chronic gastritis [5]. Further research should aim to optimize probiotic formulations and study their long-term effects [5].

Principles of Rational Antibiotic Therapy

Knowledge about infectious diseases and their treatment is constantly evolving, driven by the emergence of new pathogen identification methods such as molecular biology and mass spectrometry [8]. However, changes in the epidemiology of infectious diseases are not always predictable and are often associated with factors such as the natural course of diseases, the impact of vaccination, and, importantly, the excessive and irrational use of antibiotics [8].

Rationalizing antibiotic therapy is a key factor in slowing down the development of antimicrobial resistance [8]. This includes the correct choice of drug, dosage, course duration, and, if necessary, the combination of antibiotics. New antibiotics developed to combat resistant strains must be reserved for the most severe cases and prescribed only by specialists with appropriate knowledge and expertise [8].

Sources

1. Empiric Antibiotic Therapy of Nosocomial Bacterial Infections. https://pubmed.ncbi.nlm.nih.gov/24413366/
2. When sepsis persists: a review of MRSA bacteraemia salvage therapy. https://pubmed.ncbi.nlm.nih.gov/26565015/
3. Pharmacotherapeutic options for treating Staphylococcus aureus bacteremia. https://pubmed.ncbi.nlm.nih.gov/29115883/
4. Bloodstream infections in the Intensive Care Unit. https://pubmed.ncbi.nlm.nih.gov/26760527/
5. Traditional Chinese medicine alleviate gastrointestinal symptoms during bismuth quadruple therapy for Helicobacter pylori infection: A complementary perspective. https://pubmed.ncbi.nlm.nih.gov/41810439/
6. Lactobacillus supplementation for Helicobacter pylori eradication in children: A language-inclusive systematic review and meta-analysis of efficacy and safety. https://pubmed.ncbi.nlm.nih.gov/42626174/
7. The principles of curative antibiotic treatments. https://pubmed.ncbi.nlm.nih.gov/37716410/

Disclaimer

The information provided in this article is for informational purposes only and cannot serve as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider regarding any questions concerning your health or medical condition.