Process for the production of a porous powder product containing a microorganism, from a liquid concentrate comprising at least one culture of liquid microooganism and a carrier composition, the carrier composition comprising at least one carbohydrate and at least a protein, the process comprising the steps of: i) preparing the liquid concentrate to have a temperature between 5 and 40 ° C and to have, at the temperature of the concentrate prepared, a viscosity greater than 150 mPa.s； ii) injecting a food grade gas into the prepared concentrate at a pressure greater than 0.3 MPa to intimately incorporate the gas into the liquid concentrate and form a stable foam with a density between about 0.6 and about 1.2 kg / l； iii) transporting the foam to an atomization device, in which the foam pressure is reduced from 0.3 MPa at atmospheric pressure to provide a partially dried product； and iv) exposing the partially dried product to a drying medium to reduce the moisture content to less than 5% moisture and the water activity to less than 0.25 Aw, when measured at 20 ° C, and to provide the product in porous powder, in which the temperature of the porous powder product in step (iv) does not exceed 50 ° C.Procedimiento para la producción de un producto en polvo poroso que contiene un microorganismo, a partir de un concentrado líquido que comprende al menos un cultivo de microooganismo líquido y una composición de portador, comprendiendo la composición de portador al menos un hidrato de carbono y al menos una proteína, comprendiendo el procedimiento las etapas de: i) preparar el concentrado líquido para que tenga una temperatura entre 5 y 40ºC y para que tenga, a la temperatura del concentrado preparado, una viscosidad superior a 150 mPa.s； ii) inyectar un gas de grado alimenticio en el concentrado preparado a una presión superior a 0,3 MPa para incorporar íntimamente el gas en el concentrado líquido y formar una espuma estable con una densidad entre aproximadamente 0,6 y apr
