Detection system comprising a device for detecting the presence of at least one microorganism in the contents (101, 201) of a container (100, 200) comprising a wall with a translucent region, said detection device comprising: a) at least one light source, such as a light-emitting diode, capable of illuminating the contents (101, 201) of the container (100, 200) by emitting an excitation light beam through the translucent region of the container (100, 200); b) at least one detection means (12, 13, 14, 15), such as a photodiode, for detecting at least one reaction light beam emitted in response to the illumination of the contents (101, 201) of the container (100, 200); said at least one detection means (12, 13, 14, 15) being positioned at an angle of a set value in relation to the direction of the excitation light beam, to detect the reaction light beam; said at least one light source and said at least one detection means (12, 13, 14, 15) being equipped with at least one connection means (105, 205) located entirely outside the container (100, 200) to connect said at least one light source and said at least one detection means (12, 13, 14, 15) to the wall of the container (100, 200), in the translucent region, said connection means (105, 205) making it possible to adapt the position of the detection device on the wall of the container (100, 200), c) a control device connected to said at least one light source and to said at least one detection means (12, 13, 14, 15) to control the excitation light beam emitted by said at least one light source and/or to process and/or analyse said at least one reaction light beam emitted in response to the illumination of the contents of the container (100, 200), and detected by said at least one detection means (12, 13, 14, 15), characterized in that the detection system comprises d) a support device comprising an L-shaped base, comprising a first portion and a second portion having a surface, the detection device being fastened to the first portion of the base, the distance between the detection device and the surface being adjustable. a) at least one light source, such as a light-emitting diode, capable of illuminating the contents (101, 201) of the container (100, 200) by emitting an excitation light beam through the translucent region of the container (100, 200); b) at least one detection means (12, 13, 14, 15), such as a photodiode, for detecting at least one reaction light beam emitted in response to the illumination of the contents (101, 201) of the container (100, 200); said at least one detection means (12, 13, 14, 15) being positioned at an angle of a set value in relation to the direction of the excitation light beam, to detect the reaction light beam; said at least one light source and said at least one detection means (12, 13, 14, 15) being equipped with at least one connection means (105, 205) located entirely outside the container (100, 200) to connect said at least one light source and said at least one detection means (12, 13, 14, 15) to the wall of the container (100, 200), in the translucent region, said connection means (105, 205) making it possible to adapt the position of the detection device on the wall of the container (100, 200), c) a control device connected to said at least one light source and to said at least one detection means (12, 13, 14, 15) to control the excitation light beam emitted by said at least one light source and/or to process and/or analyse said at least one reaction light beam emitted in response to the illumination of the contents of the container (100, 200), and detected by said at least one detection means (12, 13, 14, 15), characterized in that the detection system comprises d) a support device comprising an L-shaped base, comprising a first portion and a second portion having a surface, the detection device being fastened to the first portion of the base, the distance between the detection device and the surface being adjustable.