Bedside ultrasound evaluation for infection can be performed promptly at the bedside, using simple equipment and without irradiation. Observation of the foci often enables prompt antimicrobial therapy and even early ultrasound-guided procedure, facilitating earlier confirmation. These procedures are made safer using the real-time visual control that ultrasound provides. Future challenges for an infectious diseases specialist include gaining experience and training about the appropriate use of point-of-care ultrasound. This is a second edition full-color book, in spanish, about the current use of ultrasonography in the diagnosis and treatment of infectious diseases pathologies with typical examples and more clinical cases.