Pichon G
Trans R Soc Trop Med Hyg. 1983;77(3):331-3. doi: 10.1016/0035-9203(83)90155-4.
Studying nycthemeral microfilarial density in eight carriers of Mansonella ozzardi, Nathan et al. concluded that there is an absence of periodicity in M. ozzardi in Trinidad. Re-examination of the results obtained shows evidence of crypto-periodicity. Two of the eight patients showed highly significant periodicity but the biorhythms appear to be almost out of phase, the respective peaks being at 18.00 hours and 02.00 hours. The six other patients showed no obvious periodicity; the calculated acrophases (peak hours), instead of being randomly spaced, regrouped with the preceding ones: late afternoon in two subjects and in the second half of the night for the other four. It is concluded that the apparent non-periodicity is due to the co-existence of two periodic forms, but these are markedly out of phase.
在对8名奥氏曼森线虫携带者的昼夜微丝蚴密度进行研究时，内森等人得出结论，特立尼达的奥氏曼森线虫不存在周期性。对所获结果的重新审视显示出隐性周期性的证据。8名患者中有两名表现出高度显著的周期性，但生物节律似乎几乎不同步，各自的峰值分别出现在18:00和02:00。其他6名患者未表现出明显的周期性；计算得出的高峰期（峰值时间）并非随机分布，而是与前两者重新组合：两名受试者在傍晚，另外四名在午夜后半段。得出的结论是，明显的非周期性是由于两种周期性形式共存，但它们明显不同步。
