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In this paper we present a male patient from Xinjiang with fever of unknown origin (FUO) and significant weight loss for more than one month. He was admitted to hospital with negative Rose Bengal Test (RBT) and decreased leukocyte count. Ultrasound revealed splenomegaly and abdominal computed tomography (CT) showed multiple hypodense splenic nodules. The patient was suspected of lymphoma or tuberculosis. Pathological biopsy suggested brucellosis infection following splenectomy. Anti-Brucella treatment is effective and his temperature gradually returned to normal. During the follow up, the patient's RBT result turned to positive and he was instructed to continue the anti-Brucella drug regimen. His temperature, weight, white blood cell count, other laboratory examinations and imaging findings all returned to normal during the six months follow-up after the treatment.

Cell-like P systems with channel states, which are a variant of tissue P systems in membrane computing, can be viewed as highly parallel computing devices based on the nested structure of cells, where communication rules are classified as symport rules and antiport rules. In this work, we remove the antiport rules and construct a novel variant, namely, cell-like P systems with channel states and symport rules, where one rule is only allowed to be nondeterministically applied once per channel. To explore the computational efficiency of the variant, we solve the S A T problem and obtain a uniform solution in polynomial time with the maximal length of rules 1. The results of our work are reflected in the following two aspects: first, communication rules are restricted to only one type, namely, symport rules; second, the maximal length of rules is decreased from 2 to 1. Our work indicates that the constructed variant with fewer rule types can still solve the S A T problem and obtain better results in terms of computational complexity. Hence, in terms of computational efficiency, our work is a notable improvement.