给定一篇英文文章，返回其中出现最频繁的单词和其出现次数。


“Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam nec purus nec ex convallis tristique sit amet sed velit. Vestibulum sit amet elit et felis volutpat ornare. Phasellus fermentum semper sagittis.”
The most frequent word in the given English article is "amet" which appears twice.