You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Introduction Pressure ulcer ( PU ) infection is a significant clinical problem in many elderly patients . Material and methods To determine the microbiology of PU and vascular ulcer ( VU ) infections by conducting a cross - sectional study of outpatients treated in a chronic wounds unit over an 18 month period . Results Sixty six patients with PU infection and 159 patients with an infected VU were identified . The PUs were located below the knee in 36 patients ( 52% ) . Patients with pressure ulcers had a higher proportion of institutionalization , cognitive impairment , inability to walk , and sphincter incontinence . There was a greater number of infections caused by _Enterobacteriaceae_ ( 52% , _P_ = .002 ) and fewer _S . aureus_ infections ( 24% , _P_ < .001 ) in patients with a PU compared to those with those with a VU . Forty - one percent of _S . aureus_ strains isolated in all the patients were resistant to methicillin ( MRSA ) . The proportion of _Enterobacteriaceae_ infections was similar in patients with infection of pelvic girdle PU and in those located below the knee . Conclusions PU patients suffer a higher rate of infection by enterobacteria . The most common pathogen in UV infections is _S . aureus_ . The proportion of MRSA infection in patients with chronic wounds is high . The microbiology of the infection in the pelvic girdle PU is similar to those located below the knee . 
cognitive impairment
inability to walk