Charak Samhita
प्राकृतः सुखसाध्यस्तु वसन्तशरदुद्भवः। उष्णमुष्णेन संवृद्धं पित्तं शरदि कुप्यति ॥४२॥
[Prakrita jwara(seasonal jwara)] Jwara manifesting in the vasanta or spring season and sharada or autumn season is called prakrita (seasonal) jwara and is easily curable.
english translation
prAkRtaH sukhasAdhyastu vasantazaradudbhavaH। uSNamuSNena saMvRddhaM pittaM zaradi kupyati ॥42॥
hk transliteration by Sanscript