Inflammatory Diseases

Background: The microbiome is the bacteria and other microorganisms that live inside and on the body. The microbiome is important for our health. Researchers study how the microbiome help people stay healthy. They study how the microbiome affects the body when people get sick. To do this research, they need samples of the microbiome living on the bodies of many people. The purpose of this natural history study is to collect microbiome samples in a repository. These samples will be used for future research. Objective: To collect microbiome samples from the body that can be used for future research. Eligibility: People of any age. Only those older than 3 years will be seen at the NIH clinic. Design: Participants will fill out a questionnaire. Topics will include their medical history and foods they eat. Participants will be asked to give 1 or more of the following: Stool, urine, saliva, vaginal fluid, and breastmilk. These samples can be collected at home and sent to the researchers. Cells from participants cheek, nose, mouth, skin, rectum, and/or vagina. The cells may be collected by rubbing the area with a sterile cotton swab. These procedures can also be done at home. Blood. Blood may be drawn using a needle inserted into a vein in the arm. For young children, blood may be collected by a prick on the heel or finger. Intestinal tissue samples. These may be collected from participants who are having an endoscopy or colonoscopy for other reasons. Skin tissue samples. These may be collected from participants who are having biopsies for other reasons.

Inflammatory and/or autoimmune diseases represent a very broad group of diseases with highly variable clinical features, including - but not limited to - systemic connectivites and vasculitides. As these diseases are rare and heterogeneous, it is difficult to conduct randomized clinical trials in this setting. Refractory cases are therefore treated with drugs that are already available on the market for other indications in more frequent and clinically homogeneous diseases, such as inflammatory rheumatism and haematological malignancies. Prescribing treatments from other specialties (e.g. rheumatology and oncohaematology) is a reality in the clinical practice of internists and immunologists, often representing an excellent solution for difficult-to-treat inflammatory and/or autoimmune diseases. As these molecules are prescribed without the availability of standardized data, it is essential to collect them prospectively to better characterize the efficacy and tolerability of these new therapeutic options in severe inflammatory and/or autoimmune diseases.

The goal of this randomised controlled trial study is to investigate whether exercise (brisk walking, equal to 13 on a rating of perceived exertion scale; somewhat hard) can be used as an adjuvant therapy for people living with axial spondyloarthritis and taking biologic medications to further improve their quality of life and lower their symptoms and disease burden. The main questions it aims to answer are: Does a 12-week structured home-based aerobic exercise intervention have a favourable effect on markers of immune-mediated inflammation and symptom severity? As a secondary aim and outcome, this study will investigate: * The acceptability of this intervention using questionnaires with free text boxes and one-to-one semi-structured interviews in a subset (50%) of participants (Q-ExTASI-B substudy). * The effect of the home-based intervention on circulating markers of cardiometabolic health, anthropometrical measures, and immune markers that associate with systemic inflammation. * The effect of the home-based intervention on objective measures of physical function and exercise tolerance The study will compare the data of a healthy group with that of people living with axial spondyloarthritis. Within the patient population, 20 of the individuals will be allocated to the exercise group (randomly), and 20 will be allocated to the usual care group. In the exercise group, participants will be asked to do 30 minutes of brisk walking five days a week for 12 weeks, and they will be visiting Loughborough University every four weeks to provide blood samples and fill out questionnaires. Participants in the usual care group will continue with their current care routine and will visit the study site to provide blood samples and questionnaire data every 4 weeks. The data from all axSpA patients will be compared to healthy controls, and subgroup analysis will be conducted to investigate the difference between the exercise group and the usual care group.