Modular shelter for one or more persons, comprising • at least one interior space, which is closed off from at least one adjoining exterior space by at least one peripherally closed wall, a floor and a ceiling, wherein the peripherally closed wall is pierced by at least one closable access opening, • at least one presence sensor, which detects the presence and/or absence of a person in the interior space, and • at least one first irradiation device for irradiating the interior space with UVC radiation, wherein the at least one first irradiation device is designed to irradiate the interior space with UVC radiation having a wavelength of 100 nm to 230 nm when the presence of at least one person in the interior space is detected by the presence sensor, • at least one second irradiation device, designed in such a way that the second irradiation device irradiates the interior space with UVC radiation having a wavelength above 222 nm in the event of an absence of persons in the interior space detected by the presence sensor, - an access interlock system adapted to block the access opening for the duration of irradiation by the at least one second irradiation device, • at least one air purification system for filtering the room air located in the at least one interior space, wherein the air purification system has a third air irradiation device and is designed in such a way that the room air is drawn in by the air purification system, the drawn-in room air is irradiated by the air irradiation device with UVC radiation having a wavelength of 230 nm to 280 nm, and the irradiated room air is discharged again into the interior space by the air purification system, • surfaces located in the interior space, which are formed from an antibacterial and/or antivirulent material and/or are coated with an antibacterial and/or antivirulent material. • at least one interior space, which is closed off from at least one adjoining exterior space by at least one peripherally closed wall, a floor and a ceiling, wherein the peripherally closed wall is pierced by at least one closable access opening, • at least one presence sensor, which detects the presence and/or absence of a person in the interior space, and • at least one first irradiation device for irradiating the interior space with UVC radiation, wherein the at least one first irradiation device is designed to irradiate the interior space with UVC radiation having a wavelength of 100 nm to 230 nm when the presence of at least one person in the interior space is detected by the presence sensor, • at least one second irradiation device, designed in such a way that the second irradiation device irradiates the interior space with UVC radiation having a wavelength above 222 nm in the event of an absence of persons in the interior space detected by the presence sensor, - an access interlock system adapted to block the access opening for the duration of irradiation by the at least one second irradiation device, - an access interlock system adapted to block the access opening for the duration of irradiation by the at least one second irradiation device, • at least one air purification system for filtering the room air located in the at least one interior space, wherein the air purification system has a third air irradiation device and is designed in such a way that the room air is drawn in by the air purification system, the drawn-in room air is irradiated by the air irradiation device with UVC radiation having a wavelength of 230 nm to 280 nm, and the irradiated room air is discharged again into the interior space by the air purification system, • surfaces located in the interior space, which are formed from an antibacterial and/or antivirulent material and/or are coated with an antibacterial and/or antivirulent material.