If water is affected by " red tide " , the shellfish living in that water area can be contaminated by filtering the poisonous algae or dinoflagelltes . the toxin can accumulate in the body of the shellfish . paralytic shellfish poisoning can be resulted by consumption of this contaminated shellfish 倘若水域一带发生红潮，生长于附近水域的贝类动物便可能会摄食这些含毒素的海藻，并在体内积聚毒素，人们进食这些受毒染的贝壳类动物便会产生麻痹性贝类中毒。
Dtap is found to be at least equally effective but associated with less frequent and less severe local and systemic adverse reactions when compared to dtwp . opv contains live , attenuated viruses which may cause vaccine associated paralytic poliomyelitis vapp . it is also contraindicated among individuals or household close contacts with conditions such as cancer , hiv carriers or aids patients , immunodeficiency as well as those on long term corticosteroids 原有选用的减活口服小儿麻痹病毒疫苗opv内含可导致与疫苗相关的麻痹性脊髓灰质炎vapp的减活小儿麻痹病毒，因此并不适用于出现免疫力减退的情况人士如癌症患者爱滋病带病毒者或爱滋病患者免疫力失调人士或需长期服用类固醇人士等或其家居接触者。
