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Abtropfung or dropping off effect is seen in (A) Intradermal nevus (B) Compound nevus (C) Junctional nevus (D) Blue nevus The term "abtropfung" or "dropping off effect" in the context of dermatology refers to a characteristic feature of a type of skin nevus (mole) known as a compound nevus. A compound nevus is a type of mole that is composed of melanocytes (cells that produce pigment) located both in the epidermis (the outer layer of the skin) and the dermis (the deeper layer of the skin). The term "abtropfung" or "dropping off effect" is used to describe the appearance of these nevi when they start to lose their melanocytes or pigmented cells, and these cells appear to drop off or disappear over time. So, the "abtropfung" effect is characteristic of compound nevi (B) and is not typically associated with other types of nevi like intradermal nevi (A), junctional nevi (C), or blue nevi (D). Follow us on WhatsApp channel 

Central Nervous System (CNS) infections can be caused by a variety of bacteria. These infections can have serious consequences and may lead to conditions such as meningitis, encephalitis, or brain abscesses. Here are some bacteria that can cause CNS infections: 1. **Neisseria meningitidis**:    - Causes bacterial meningitis.    - Commonly transmitted through respiratory droplets.    - Can lead to severe inflammation of the meninges (protective layers surrounding the brain and spinal cord). 2. **Streptococcus pneumoniae**:    - Another common cause of bacterial meningitis.    - Often occurs after respiratory tract infections.    - Can lead to life-threatening complications if not treated promptly. 3. **Haemophilus influenzae**:    - Previously a common cause of bacterial meningitis in children, but now less common due to vaccination.    - Can also cause other respiratory infections. 4. **Listeria monocytogenes**:    - Can lead to meningitis, particularly in newborns, the