]. The vast majority of sarcoidosis literature starts with something similar to the following sentence "Sarcoidosis is a multi-system granulomatous disease of unknown aetiology predominantly affecting the lung". The unknown cause continues to inspire researchers to search for a possible trigger, especially if new and high-throughput methods are at their disposal. The histological hallmark of sarcoidosis is epithelioid cell granuloma. Formation of granuloma is a common reaction towards, for example, bacterial agents. Evidence for bacterial involvement in sarcoidosis consist of presence of bacterial peptides inside lung granuloma and other products derived from sarcoidosis patients, the ability of these products to produce a granulomatous reaction in human and in mice, and the success of anti-microbial therapy in patients [1, 2]. Although active infection has not been found, bacteria, and in particular mycobacteria, are thought to be a causative or disease modifying factor in sarcoidosis.