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Ciprandi, G.;  Damiani, V.;  Cordara, V.;  Tosca, M.A. Local Bacteriotherapy for Preventing Respiratory Infections. Encyclopedia. Available online: https://encyclopedia.pub/entry/36370 (accessed on 27 July 2024).
Ciprandi G,  Damiani V,  Cordara V,  Tosca MA. Local Bacteriotherapy for Preventing Respiratory Infections. Encyclopedia. Available at: https://encyclopedia.pub/entry/36370. Accessed July 27, 2024.
Ciprandi, Giorgio, Valerio Damiani, Vittorio Cordara, Maria Angela Tosca. "Local Bacteriotherapy for Preventing Respiratory Infections" Encyclopedia, https://encyclopedia.pub/entry/36370 (accessed July 27, 2024).
Ciprandi, G.,  Damiani, V.,  Cordara, V., & Tosca, M.A. (2022, November 24). Local Bacteriotherapy for Preventing Respiratory Infections. In Encyclopedia. https://encyclopedia.pub/entry/36370
Ciprandi, Giorgio, et al. "Local Bacteriotherapy for Preventing Respiratory Infections." Encyclopedia. Web. 24 November, 2022.
Local Bacteriotherapy for Preventing Respiratory Infections
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This entry is adapted from the peer-reviewed paper 10.3390/allergies2040013

Recurrent respiratory infections (RRIs) account for relevant economic and social implications and significantly affect family life. Local Bacteriotherapy (LB) represents an innovative option in preventing RRIs. Local bacteriotherapy consists of administering “good” and safe bacteria (probiotics) by nasal or oral route. 

recurrent respiratory infections local bacteriotherapy Streptococcus salivarius 24SMB Streptococcus oralis 89a nasal spray oral spray

1. Introduction

Infections of the respiratory tract have a profound impact on society. Namely, respiratory infections (RIs) entail a relevant socioeconomic burden for society and for families [1][2][3]. In addition, RIs present a compelling challenge for pediatricians, otolaryngologists, general practitioners, and allergists [4]. Frequent RI configures a rather common clinical picture in childhood and is referred to as recurrent respiratory infection (RRI). Previously, inclusion criteria for RRI encompassed a history of more than six RIs yearly, excluding primary and secondary immunodeficiency, cystic fibrosis, primary ciliary dyskinesia, and airway malformations [5]. Successively, further RRI classifications were added, also considering localized infections [6][7][8][9][10][11].
Inadequate management of RRIs results in frequent doctor’s office visits, hospital admissions, overuse/abuse of antibiotics, and school and parental work absences.
Consequently, it is important to attempt to identify risk factors associated with RRI. In this regard, a relevant role is to be attributed to prematurity, preschool age (for relative immaturity of the immune system), early attendance at nursery school, indoor and outdoor pollution, home dampness, passive exposure to tobacco or vape fumes, low socio-economic level, overcrowding, and allergic diseases [12]. Indeed, allergic diseases may significantly predispose an individual to RI recurrence through different pathophysiologic mechanisms [13][14]. Type 2 immunity presumes a consequential defect of type 1 immune response that contributes to fighting infections [15]. As a result, allergic subjects are prone to contract infections more frequently and severely than healthy subjects [16]. As proof of this mechanism, allergen-specific immunotherapy, restoring a normal balance between type 1 and 2 immunity, consequently reduces predisposition to RI [17]. Namely, this research demonstrated that subjects undergoing allergen-specific immunotherapy had significantly less respiratory infections than control allergic subjects who did not undergo this treatment.
Another important concept should be noted: viral infections reduce the mechanisms of immune defense, thereby promoting infection recurrence [18]. Additionally, viral infections are frequently associated with bacterial super-infections, which in turn prompts doctors to prescribe antibiotics, further reducing immune defenses and promoting antibiotic resistance [19][20]. Furthermore, bacterial overgrowth induces the generation of biofilm, i.e., surface-attached, structured microbial communities containing sessile cells (bacteria and/or fungi) embedded in a self-produced extracellular matrix composed of polysaccharides, DNA, and other components, making them more resistant to bacteria and promoting their in situ permanence [21][22]. Notably, biofilm may be envisaged as an “influencer” of repeated infections that favors bacterial survival and contrasts host aggression [23].
Last but not least, infections per se cause dysbiosis both at intestinal and respiratory levels, thus contributing to the maintenance of the vicious circle that allows RRI [23]. Taking into consideration all these concepts, being able to prevent RRIs is crucial in reducing costs and complications, as well as improving socioeconomic aspects. In this regard, many attempts have been made to prevent RRI. Therefore, using “good” bacteria (probiotics) through local administration could be an attractive strategy [24].

2. The Meaning of Local Bacteriotherapy

Microbiota includes the microorganisms living inside the human body, mainly harboring on organs communicating with the outside environment [25][26]. A close relationship between the microbiota and human body (symbiosis) is well established [27][28]. Indeed, it is well known that probiotics interfere with pathogen growth [29]. Probiotics are live bacteria which, when given in adequate amounts, confer a benefit to the consumer, as stated by World Health Organization.
Consistent colonization by bacteria able to “interfere” with pathogen growth restores eubiosis and may prevent RI [30]. This phenomenon can occur as it has been evidenced that some strains of a-Streptococci produce substances characterized by microbicidal activity against pathogens, which have been called bacteriocin-like inhibitory substances (BLIS) [31]. As a result, the manipulation and use of probiotics in relation to the microbiota of upper airways could be an attractive strategy for preventing RI [32]. This practice was first proposed over 70 years ago, coining the term “Bacteriotherapy” [33].
Preliminary attempts were performed in the early 1950s [34][35][36]. As bacteria were usually administered directly into the airways, the term “Local Bacteriotherapy” became popular.
Recently, there has been a revival of interest in this medical practice, especially following the great success of the use of probiotics in medicine. Probiotics have been proposed to maintain or restore eubiosis in conditions characterized by dysbiosis.
To explain the efficacy of this practice, different mechanisms have been explored. The main mechanism consists of interference and/or inhibition of pathogens as a result of the production of proteins with microbicidal activity and mediators with immunomodulating properties, as outlined in Figure 1 [31].
Figure 1. Characteristics of children with recurrent respiratory infections and the effects of Local Bacteriotherapy.
In particular, preliminary studies investigated the potential of one streptococcal strain, Streptococcus salivarius 24SMB. S salivarius is a non-pathogenic species able to colonize the oral cavity and can be considered a primary BLIS producer [37]. This strain exerted significant activity against S pneumoniae, was harmless to other S salivarius species, was non-pathogenic, and adhered to human larynx cells [38]. Successively, the topical administration of S salivarius by nasal spray allowed its colonization into the nasopharynx [39]. These preliminary experiences opened the way to new applications based on the local administration of probiotics, such as those in Local Bacteriotherapy. This approach allowed upper airways to be re-colonized with healthy microbes and led to pathogens being displaced by bacterial interference, in contrast with the present dysbiosis [39].

3. Local Bacteriotherapy: The Evidence

The first trial was designed as a randomized, double-blind, placebo-controlled study and included 100 children suffering from recurrent otitis media between the ages of 1 and 5 [40]. The study showed that Streptococcus salivarius 24SMB nasal spray reduced the number of otitis episodes and the use of antibiotics.
A real-life study was performed to confirm the previous trial and 267 children with predisposition to recurrent otitis were enrolled [41]. Children were stratified into two groups: 159 were treated with a nasal spray containing a bacterial mixture, containing Streptococcus salivarius 24SMB and Streptococcus oralis 89a, and 108 served as control. A previous study isolated Streptococcus oralis 89a from a child suffering from recalcitrant tonsillitis and showed that this strain inhibited the growth of Group A Streptococci [42]. The real-life study demonstrated that LB significantly reduced the frequency and severity of otitis episodes.
A further in vitro study demonstrated that both strains inhibited biofilm formation and dissolved preformed biofilms [43].
A prospective trial, conducted on 42 children presenting sleep-disordered breathing and RRI, showed that LB with both strains improved sleep characteristics and nasal airflow and reduced oral breathing after 3 months [44].
A further clinical study that enrolled 80 children with RRI reported that LB halved respiratory infections and reduced school and parental work absences [45].
Another study explored the possibility of preventing adenoidectomy using LB [46]. Forty-four children were waitlisted for adenoidectomy and tympanocentesis due to being diagnosed with adenoid hypertrophy or otitis media with effusion. Children were subdivided into two groups: 22 treated with LB nasal spray and 22 with hypertonic saline. The study evidenced that LB significantly reduced the need for surgery and improved tympanometry.
A successive study included 202 children with RRI that were treated with LB [47]. Local Bacteriotherapy significantly diminished RI episodes compared to the previous year.
An observational trial enrolled 79 children (1–6 years of age) with recurrent otitis and treated them with LB nasal spray, and a further 70 children were used as the control group [48]. Local bacteriotherapy significantly diminished otitis episodes.
The last study included 91 children suffering from RRI [49]. Local Bacteriotherapy nasal spray reduced respiratory symptoms and otalgia. Older children were more responsive than younger.
Recently, a new administration route was proposed for LB. It consists of an oral formulation containing Streptococcus salivarius 24SMB and Streptococcus oralis 89a, as well as the nasal spray formulation. Therefore, two trials explored the efficacy and safety of oral LB.
The first randomized controlled trial concerned 82 children suffering from recurrent streptococcal pharyngotonsillitis caused by Group A Streptococci [50]. The results confirmed that oral LB also diminished the prevalence and duration of GABHS infections, antibiotic consumption, and school absences.
The second trial was conducted as a real-life study and included 51 children (mean age of 4.8 years) with RRI [51]. This experience also confirmed that oral LB reduced RI and school absences.

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Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Giorgio Ciprandi
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Valerio Damiani
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Vittorio Cordara
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Maria Angela Tosca
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