with reference to said figures a device of the invention in accordance with the illustrated example comprises an essentially cylindrical test tube 10 containing a culture medium in gel form 11 presenting a free surface level 12 inside the test tube the upper open end of the test tube presents a collar 13 for receiving a closure means the device is completed by a swab 20 consisting of a rod 14 carrying at one end a stopper 15 which has to act as the closure means of the test tube and is hence shaped so that it can engage for example by snap engaging with the collar 13 of the test tube at the opposite end the rod 14 terminates with a tip 16 carrying a suitable means for example a layer of fibre 17 for collecting the specimen to be analysed in the illustrated example said tip 16 of the rod is shaped in a rounded geometry similar to an ogive and said fibre 17 being disposed as a layer of uniform thickness in general terms in accordance with the fundamental characteristic of the invention said fibre with hydrophilic properties is deposited by means of flocking the flocking technique is preferably of the type conducted in an electrostatic field which deposits the fibres in an ordered manner perpendicular to the surface of the tip of the swab rod which has been previously coated with adhesive for example by immersion or spraying the fibre which is to form the flocked layer is subjected to an electrostatic field and is hence deposited in an oriented manner and anchored to the surface of the tip being retained.