A filtration device for use in solid-phase cytometry, said filtration device being configured to filter a sample likely to contain microorganisms and allow analysis thereof, the filtration device comprising:
- a filtration membrane configured to filter the biological sample, the filtration membrane having an upper face and a lower face,
- characterized in that the filtration device further comprises at least:
- a coverslip arranged above the upper face of the filtration membrane, the coverslip being arranged so as to cover the entire upper face of the membrane,
- an interstitial space formed between the coverslip and the upper face of the filtration membrane, the interstitial space being shaped to receive a fluid.