Nice observation, and this is a very common doubt.

Short answer: No, you do not get paap (pāpa) for what your white blood cells (leukocytes) are doing naturally inside the body.

Here’s why, in simple Jain terms:

1. Ahimsa is mainly about intent and conscious action

- Himsa = violence done with intention, awareness, and involvement (karta–bhāva). - Our immune cells work without our conscious will. We are not sitting and deciding: “Now let my leukocytes kill these bacteria.” - So, there is no direct kartābhāva (doer‑ship) from the soul’s side in that micro‑process.

1. Natural body processes are classified separately

Jain texts explain that: - Simply having a body means many automatic functions: digestion, old cells dying, new cells forming, immune defence, etc. - These are paryāya (changing states) of pudgala (matter). - The jīva binds karma mainly where there is rāga–dveṣa (attachment–aversion) and conscious involvement, not for every automatic movement of the body.

1. Where does pāpa come in then?

- If we do things that unnecessarily increase such harm (e.g., wrong diet, addictions, carelessness, anger, etc.), then the intent and carelessness can become cause of pāpa. - Example: overeating or eating very unhealthy food knowingly, causing disease, then a lot of extra suffering and internal disturbance arises. Here, pāpa is due to intention and negligence, not because leukocytes kill germs.

1. What is our duty from the Jain view?

- Keep the body as pure, simple, sattvic and non‑violent as possible (Jain aahar–maryādā). - Avoid himsa in thought, speech and external actions. - Maintain shubha bhāva: friendliness (maitrī), compassion (karuṇā), no hatred even towards harmful microbes or disease.

1. Important distinction

- Killing a being with your own conscious action → clear himsā → pāpa. - Micro‑killing happening automatically inside the body for survival, without your intention → not counted like that in Jain ethics.

So, from Jain dharma angle:

• Focus on making your intent and lifestyle as ahimsak as possible.
• Don’t feel guilty about the natural defence system of the body; instead, use this human life to purify inner passions (krodh, mān, māyā, lobh) – that is where real pāpa and puṇya are mainly bound.

If you want to read more on ahimsa in daily life and in food, you can see detailed explanations here:

• Ahimsa and the mahāvratas
• Ahimsa in food choices