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मांसस्रोतांस्यनुगतो जनयेत्तु तृतीयकम्। संश्रितो मेदसो मार्गं दोषश्चापि चतुर्थकम् ॥६६॥
Anyedushyaka jwara is caused by the affliction of rakta dhatu (blood) also. Tritiyaka jwara manifests when the dosha afflict the mamsa dhatu (muscular tissues). Dosha lodging in the channels of circulation of medo dhatu cause chaturthaka jwara.
english translation
अन्येद्युष्कः प्रतिदिनं दिनं हित्वा तृतीयकः। दिनद्वयं यो विश्रम्य प्रत्येति स चतुर्थकः ॥६७॥
Anyedushka jwara occurs every day, while tritiyaka jwara occurs after a gap of one day and chaurthaka occurs after two days gap.
english translation
अधिशेते यथा भूमिं बीजं काले च रोहति। अधिशेते तथा धातुं दोषः काले च कुप्यति ॥६८॥
[Cause of alterations in jwara episodes] As a seed remains dormant in the soil and germinates at a favorable time, similarly the doshas remain in dormant condition in the dhatu and get aggravated at a favorable time.
english translation
स वृद्धिं बलकालं च प्राप्य दोषस्तृतीयकम्। चतुर्थकं च कुरुते प्रत्यनीकबलक्षयात् ॥६९॥
These dosha gain strength at an appropriate time and when the power of the inhibiting (disease preventing) factors has subsided, then the tritiyaka and chaturthaka jwara manifest.
english translation
कृत्वा वेगं गतबलाः स्वे स्वे स्थाने व्यवस्थिताः। पुनर्विवृद्धाः स्वे काले ज्वरयन्ति नरं मलाः ॥७०॥
The dosha lose their strength after manifesting their signs and symptoms of aggravation and get lodged in their respective places. They again get aggravated and afflict the person with jwara.
english translation