## 3 Results  
In Table 1, demographical and anthropometric parameters of the patients involved in the study, matched for sex, age and BMI, are reported. No statistical difference was detected between the two reported groups of subjects.  
Table 2 describes the different anaerobic species identified in the stool samples of the 40 subjects participating to the study. Our results show that a total of 9 Gram\(-\) and 9 Gram\(+\) species of anaerobic bacteria were present in the feces of these subjects. It is worth noting that all species of Gram\(-\) anaerobic bacteria are part of the _Bacteroides_ family which represents the 50% (9/18) of all bacterial species identified.  
\begin{table}
\begin{tabular}{c|c c c} \hline
**Pts. Data** & **SCA/P** & **Control** & \(p\)**Value** \\ \hline
**Age** & 63.4 \(\pm\) 8 & 64.5 \(\pm\) 4 & 0.56 \\
**Sex** & M:14, F:6 & M:11, F:9 & 0.61 \\
**BMI** & 29.8 \(\pm\) 5.4 & 30.3 \(\pm\) 7.2 & 0.76 \\
**Weight (Kgs)** & 80.5 \(\pm\) 12.3 & 77.3 \(\pm\) 13.8 & 0.45 \\ \hline \end{tabular}
\end{table}
Table 1: Demographical and anthropometric parameters of the patients involved in the study.  
Figure 1 reports the different gut microbiota species (Gram\(-\) and Gram\(+\)) recognized in the fecal samples of the two groups of subjects. In controls and SCA/P patients the total number of bacterial species identified was similar (7 Gram\(-\) and 6 Gram\(+\)). However, among Gram- bacteria, all anaerobic bacteria belonging to the Bacteroides genus, two species, _Bacteroides stercoris_ and _Parabacteroides distasonis_, were found only in the feces from control group, whereas _Bacteroides fragilis_ and _Prevotella melaninigenica_ species were present only in SCA/P patients. Moreover, it appears evident, among the 5 bacterial species present in both groups of subjects, that the detection of _Bacteroides ovatus_ (B.o.), _Bacteroides uniformis_ (B.u.) and _Bacteroides vulgatus_ (B.v.) was tripled, doubled and slightly higher, respectively, in control group as compared to SCA/P patients, while the presence of _Parabacteroides merdae_ (Pa.m.) was double in the SCA/P group as compared to control subjects. Similar presence was evidenced for _Bacteroides thetaiotaomicron_ (B.t.) in both groups of fecal samples.  
As far as the Gram\(+\) bacteria identified in the two group of subjects (Figure 1), similarly to what observed in Gram\(-\) bacteria, specific bacterial species were found in the two groups: _Clostridium clostridiforme_ (C.c.), _Propioniibacterium avium_ (Pr.a.) and _Pedioccus pentasaceus_ (Pe.p) were identified in control group only, while _Eubacterium limosum_ (Eu.l.), _Clostridium innocuum_ (C.i.) and _Corynebacterium xerosus_ (Cor.x.) were identified in SCA/P feces only.  
Among the bacteria presents in both groups of feces, _Bifidobacterium spp_ (Bif.) resulted tripled in control group compared to SCA/P group, while similar was the presence of _Clostridium ramosum_ (C.r.) and _Clostridium Sardelli_ (C.s.) in both group of fecal samples.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Gram+ Bacteria** & \multicolumn{3}{c}{**Gram\(-\) Bacteria**} \\ \hline _Bifidobacterium_ **spp** & **Biff.** & _Bacteroides fragilis_ & **B.f.** \\ \hline _Clostridium clostridiforme_ & C.c. & _Bacteroides ovatus_ & B.o. \\ \hline _Clostridium innocuum_ & C.i. & _Bacteroides stercoris_ & B.s. \\ \hline _Clostridium ramosum_ & C.r. & _Bacteroides_ & \\ _Clostridium randomis_ & C.r. & _thetaiotaomicron_ & B.t. \\ \hline _Clostridium Sardelli_ & C.s. & _Bacteroides uniformis_ & B.u. \\ \hline _Corynebacterium xerosus_ & Cor. x. & _Bacteroides vulgatus_ & B.v. \\ \hline _Propioniibacterium avium_ & Pr.a. & _Prevotella melaninigenica_ & Pre.m. \\ \hline _Eubacterium limosum_ & Eu.l. & _Parabacteroides distasonis_ & Pa.d. \\ \hline _Pediococcus pentosaceus_ & Pe.p. & _Parabacteroides merdae_ & Pa.m. \\ \hline \hline \end{tabular}
\end{table}
Table 2: Fecal anaerobic bacteria species isolated from the subjects involved in the study.