The method for collecting cell material from particular cells present in a liquid comprises: - a step (210) of insertion of the liquid into a compartment (105) via an upper opening (106) of the compartment, said compartment having a lower opening (107), between the two openings being positioned a filter (115) whose micropores have a diameter intermediate between that of said particular cells and that of other cells, - a step (215) of filtration during wherein the main liquid and said other cells pass through the filter, a step (230) of lysis and amplification of the DNA and / or RNA and a step (250) of recovery of the material amplified genetics of lysed cells, on the filter.
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