[Detection of drug-resistance genes of Mycoplasma pneumoniae in bronchoalveolar lavage fluid of children with refractory Mycoplasma pneumoniae pneumonia]

Recent Macrolide Resistance Pattern of Mycoplasma Pneumonia in the World: A Systematic Review and Meta-Analysis

Background

We aimed to systematically review and analyze the prevalence and pattern of resistance in Mycoplasma pneumoniae.

Methods

We searched authentic scientific sources and databases, and reference lists of relevant articles from Jan 1, 2017, to Jun 1, 2023.

Results

Most of the included studies were conducted in Asia (11470 patients). The overall pooled prevalence was 53% (41%-65%), I2=99.69%; P <0.001. While subgroups analyses revealed that the pooled prevalence for America (3 studies), Asia (29 studies), and Europe (3 studies) was 9% (5%-12%), 62% (52%-73%), and 6% (1%-12%), respectively. Twenty-one eligible studies for determining of A2063G and 16 for A2064G were analyzed. Global pooled prevalence was 67% (58%-76%), I2=99.65%; P<0.001, and 3% (2%-4%), I2=87.44%; P<0.001 for A2063G and A2064G, respectively. Pooled prevalence of A2063G for America, Asia and Europe was 10% (5%-16%), 77% (71%-83%) and 5% (2%-9%), respectively.

Conclusion

While the prevalence of macrolide-resistant M. pneumonia is quite low in America, it is a great dilemma in East Asia and the low prevalence in most countries could be underestimated. This study revealed an increasing trend in macrolide resistance. Indiscriminate and improper use of macrolides may be a warning in this regard.

Case Report: Omadacycline in the treatment of macrolide-unresponsive Mycoplasma pneumoniae pneumonia in an adolescent patient

Omadacycline is a novel tetracycline antibiotic that exhibits good in vitro antibacterial activity against atypical pathogens such as Mycoplasma pneumoniae. It is approved for the treatment of adults with community-acquired bacterial pneumonia. However, the safety and efficacy of omadacycline in pediatric patients under 18 years of age have not yet been established. In the present paper, we report a case of pediatric community-acquired pneumonia in which initial empirical anti-infective therapy had failed. The patient received empirical anti-infective therapy with azithromycin and other antimicrobial agents upon admission but showed a poor clinical response and developed secondary tinnitus and liver dysfunction. After the confirmation of M. pneumoniae infection through metagenomic next-generation sequencing (mNGS) of bronchoalveolar lavage fluid, an antibiotic switch to omadacycline was made. Thereafter, the patient's condition improved, and no adverse reactions were observed. These findings demonstrate that mNGS enables the identification of infection-causing pathogens in patients with unresponsive pneumonia. Omadacycline can be considered as an alternative option for anti-infective therapy in pediatric M. pneumoniae pneumonia, especially when the presence of bacterial resistance, adverse drug reactions, or organ failure are taken into consideration.

Efficacy of Gamma Globulin Combined with Azithromycin Sequential Therapy in the Treatment of RMPP and Its Effect on Th1/Th2 Cytokine Levels

Objective

To investigate the efficacy of gamma globulin combined with azithromycin sequential therapy in the treatment of children with refractory mycoplasma pneumonia and its effect on Th1/Th2 cytokine levels.

Method

From January 2021 to January 2022, 100 children diagnosed with refractory mycoplasma pneumonia were randomly divided into 2 groups (50 cases in each one), the control group was treated with azithromycin plus comprehensive basic treatment, and the treatment group was treated with combined treatment on the basis of the control group, gamma globulin therapy; the treatment effect and cytokine levels of the two groups were compared.

Results

Th1, Th2, and Th1/Th2 before treatment were not significantly different between the two groups. Th1, Th2, and Th1/Th2 in the treatment group were significantly downregulated compared with those in the control group after treatment. The levels of IgG, IgA, and IgM in the treatment group were not significantly different from those in the control group before treatment but were significantly upregulated after treatment. IL-10, IL-6, and IL-2 levels were also significantly increased in the treatment group. The disappearance time of clinical symptoms such as fever, cough, and pulmonary rales in the treatment group was significantly shorter than that in the control group, and the cure rate in the treatment group was significantly better than that in the control group.

Conclusion

The clinical effect of gamma globulin combined with azithromycin sequential therapy in the treatment of children with refractory mycoplasma pneumonia is remarkable, which can reduce inflammatory factors, improve patients' immunity, and promote disease recovery.